Alphanumeric Sequence

Introduction

Alphanumeric sequence is an important chapter in reasoning and the questions on this subject are asked in almost all the competitive exams. Alphanumeric sequence is a sequence which consists of both alphabets and numbers. In this sequence, we can also add some symbols along with alphabets and numbers.

For example we can make an alphanumeric sequence as follows −

A $ E R 9 * T 5 F 6 @ D 8

In the above sequence, we can see that there are numbers, alphabets, and symbols. These types of sequences are called alphanumeric sequence. We can make many sequences like this and can deduce questions based on the sequences.

Important Points to Remember

Let’s have an alphanumeric sequence −

A $ E R 9 * T 5 F 6 @ D 8

Questions regarding this chapter can come in this way −

a. Which element is n^th from the left of the sequence?

b. Which element is n^th from the right of the sequence?

c. Which element is m^th to the right of n^th from the left of the sequence?

d. Which element is m^th to the left of n^th from the left of the sequence?

e. Which element is m^th to the right of n^th from the right of the sequence?

f. Which element is m^th to the left of n^th from the right of the sequence?

g. A precedes B

h. B is preceded by A

i. B follows A

j. A is followed by B

To solve questions like this, we have to watch the sequence thoroughly and answer accordingly.

a. Which element is n^th from the left of the sequence?

To get the answer of the above question, we have to look at the sequence from the left side and have to count the exact number that is asked in the question.

b. Which element is n^th from the right of the sequence?

To get the answer of the above question, we have to look at the sequence from the right side and have to count the exact number that is asked in the question.

c. Which element is m^th to the right of n^th from the left of the sequence?

To get the answer for such type of questions, we have to find out the n^th element from the left side of the sequence and then find out the m^thelement to the right of that particular element.

d. Which element is m^th to the left of n^th from the left of the sequence?

To get the answer for such type of questions, we have to find out the n^th element from the left side of the sequence and then find out the m^thelement to the left of that particular element.

e. Which element is m^th to the right of n^th from the right of the sequence?

To get the answer for such type of questions, we have to find out the n^th element from the right side of the sequence and then find out the m^th element to the right of that particular element.

f. Which element is m^th to the left of n^th from the right of the sequence?

To get the answer for such type of questions, we have to find out the n^th element from the right side of the sequence and then find out the m^th element to the left of that particular element.

g. If it is written that A precedes B then it means A is placed before B.

h. Similarly if it is written that B is preceded by A then it means A is placed before B.

i. If it is written that B follows A then it means B is placed after A.

j. If it is written that A is followed by B then B is placed after A.

These ten type of questions are normally asked in this chapter. Whether it is of a type or b type or c type or j type we have to read the question carefully and see the sequence and finally we can get the answer according to the question.

Samples

A F % 5 G H & 8 Y 6 3 N M * ! H 8

I- Which element is 3^rd to the right of 5^th from left?

Options −

A - &

B - 8

C - 6

D - 3

Answer − Option B

Explanation −

By observing the sequence, we can get that 8 is the required element at the required place, hence, option b is correct.

II - How many numbers are there which are immediately preceded by a symbol and followed by a consonant?

Options −

A - One

B - Two

C - Three

D - None

Answer − Option B

Explanation −

Only two are possible and they are: % 5 G and & 8 Y.

III - Which element is 4^th to the left of 5^th from right?

Options −

A - 8

B - 6

C - 3

D - Y

Answer − Option D

Explanation −

Y is the required element. Hence option D.

Direction: Study the following information carefully and answer the questions.

W 7 @ I R P 3 9 B A $ 4 H D 5 © M E 2 % T * 8 δ U Q N 1 V 6 # K F

Question 6

How many such consonants are there in above arrangement, each of which is immediately preceded by a consonant and immediately followed by a symbol?

• A None
• B One
• C Two
• D Three
• E More than three

sol:No such combination is there in the given arrangement.

Direction: Study the following information carefully and answer the questions.

W 7 @ I R P 3 9 B A $ 4 H D 5 © M E 2 % T * 8 δ U Q N 1 V 6 # K F

Question 7

if all the symbols are dropped from the above arrangement, which of the following will be the fifteenth from the left end?

• A E
• B 5
• C D
• D 2
• E None of these

Sol: Let we dropped all the symbols from the above arrangement, we get fifteenth from the left end : E

Direction: Study the following information carefully and answer the questions.

W 7 @ I R P 3 9 B A $ 4 H D 5 © M E 2 % T * 8 δ U Q N 1 V 6 # K F

Question 8

How many such numbers are there in the above arrangement, each of which is immediately preceded by a symbol and immediately followed by a consonant?

• A None
• B One
• C Two
• D Three
• E More than three

Sol:Such numbers those are there in the above arrangement, each of which is immediately preceded by a symbol and immediately followed by a consonant $ 4 H (only one such combination is there)

Direction: Study the following information carefully and answer the questions.

W 7 @ I R P 3 9 B A $ 4 H D 5 © M E 2 % T * 8 δ U Q N 1 V 6 # K F

Question 9

Four of the following five are alike in a certain way based on their positions in the above arrangement and so form a group. Which is the one that does not belong to that group?

• A T * E
• B Q N 8
• C 3 9 I
• D 6 V K
• E % T M

Sol: In the following four (T * 2, Q N 8, 3 9 I, % T E) the first two characters are line in the same sequence in the given series

W 7 @ I R P 3 9 B A $ 4 H D 5 © M E % T * 8 δ U Q N 1 V 6 # K F

But in 6 V K first two characters 6 and V are ling in reverse order in in the series (i.e. V 6). Hence 6 V K is different from others.

Direction: Study the following information carefully and answer the questions.

W 7 @ I R P 3 9 B A $ 4 H D 5 © M E 2 % T * 8 δ U Q N 1 V 6 # K F

Question 10

Which of the following is the ninth to the right of the twenty – second from the right end of the above arrangement?

• AH
• B#
• CT
• D@
• ENone of these

Sol: The twenty – second from the right end is $ the ninth to the right of the twenty – second from the right end ($) : T

Solved Questions

Study the following arrangement carefully and answer the question given below −

6 R 0 T 4 A 8 % B F 1 E # W @ 9 H I $ M N * 3 2 V $ 5 G P 7 Q

Q 1 − How many such consonants are there in the above arrangement, each of which is immediately preceded by a consonant and immediately followed by a number?

A - None

B - One

C - Two

D - Three

Answer - C

Explanation

According to question

Consonant –Cosonant-Number

B -F -1

G -P -7

Study the following arrangement carefully and answer the question given below −

6 R 0 T 4 A 8 % B F 1 E # W @ 9 H I $ M N * 3 2 V $ 5 G P 7 Q

Q 2 − How many such vowels are there in the above arrangement, each of which is immediately preceded by a letter but immediately not followed by a symbol?

A - None

B - One

C - Two

D - Three

Answer - B

Explanation

According to question

Letter-Vowels-Letter/Number

R - O - T

Study the following arrangement carefully and answer the question given below −

6 R 0 T 4 A 8 % B F 1 E # W @ 9 H I $ M N * 3 2 V $ 5 G P 7 Q

Q 3 − Which of the following is the fourth to left of the twelfth from the left end?

A - 8

B - B

C - 2

D - %

Answer - D

Explanation

According to question.

L - L = L

12 - 4 = 8^TH

So the required element is %.

Study the following arrangement carefully and answer the question given below −

6 R 0 T 4 A 8 % B F 1 E # W @ 9 H I $ M N * 3 2 V $ 5 G P 7 Q

Q 4 − Three of the following four are alike in a certain way based on their positive in the above arrangement and so form a group. Which is the one that does not belong to that group?

A - 406

B - F%A

C - @#1

D - $H9

Answer - D

Explanation

Direction: Study the following information carefully and answer the questions given below:

NGH ASB OWP BCA RMO

Question 1.

If the given words are arranged in the reverse order as they would appear in the English dictionary from left to right, which of the following will be the second from the right?

• A NGH
• B ASB
• C OWP
• D BCA
• E RMO

Q2. If in each of the given words, each of the consonant is changed to a letter which is two place before that consonant and each vowel is changed to a letter which is three place after that vowel in English alphabetical series, then how many words thus formed would be having two vowels?

• A 0
• B 1
• C 2
• D 3
• E 4

Sol: After arranging the words,

LEF DQZ RUN ZAD PKR

There is no word having two vowels.

Q3. If in each of the given words, all the consonants are changed to next letter in English alphabetical order than all the alphabets are arranged in English alphabetical order within the word from left to right, then how many words will have vowel at first place?

• A 0
• B 1
• C 2
• D 3
• E 4

sol:

Change consonant to next letter,

OHI ATC OXQ CDA SNO

Arrange alphabets in English alphabetical order,

HIO ACT OQX ACD NOS

ACT, OQX and ACD have vowel at the first place.

Question 4 If in all the words, the first alphabet is changed to the previous letter and last alphabet is changed to next letter in English alphabetical series then how many words will begin and end with the same letter?

• A 0
• B 1
• C 2
• D 3
• E 4

Sol:After arranging the words,

MGI ZSC NWQ ACB QMP

No such word starts and ends with same letter.

Question 5

How many letters are there in the English alphabetical series between the second letter of the second word from the right and second letter of the first word from the left?

• A 0
• B 1
• C 2
• D 3
• E 4

Sol: The second letter of the second word from the right is ‘C’. -

The second letter of the first word from the left is ‘G’.

There are three letters (D, E & F) between C and G in English alphabetical series.

Direction: Study the following information carefully and answer the given question.

Seven friends A, B, C, D, E, F and G go to gym on seven different days of a week (Starting from Monday to Sunday). Three of them go twice in a week. At least one person goes each day. They have joined the gym in different months viz. January, February, March, April, May, June and July. They also do Cycling, Swimming, Running, Walking and Weightlifting. Two of them do Swimming and Cycling.

● A does not do running or cycling. Only D has joined after him. F and G go to gym on consecutive days.

● B and C go to gym twice a week and they don’t do swimming or walking. B joined before C.

● G joined the gym just before E. G and E don’t do weightlifting and swimming. They do same exercise.

● F does walking. He joined in the month which has 30 days.

● E joined the gym in the second month of the year. He goes twice a week, Thursday and Sunday. D does not go to gym after C.

● C and E do exercise on consecutive days in both cases.

● A and D has maximum possible gap in days of their gym days.

● The one who walks, goes to gym alone. B goes to gym just before F goes. The one who goes to gym on Wednesday do Running.

● A and D do same exercise. B does not go with D.

Question 1 How many people (if person go twice, count it as 2), go before F in a week?

• A 5
• B 4
• C 3
• D 6
• E None of these

Question 2 Which of the following is correct?

• A G and C go to gym on Sunday
• B B joined the gym in May
• C The one who runs has joined in March
• D The people who swim go on Sunday and Monday
• E All are incorrect

Question 3 Which of the following is incorrect?

• A G—Cycling—Saturday
• B Swimming—Sunday—June
• C B—Weightlifting—March
• D D—Monday—July
• E April—Friday—Running

Question 4

On which days B go to gym?

• A Wednesday, Saturday
• B Monday, Friday
• C Tuesday, Thursday
• D Saturday, Tuesday
• E None of these

Question 5

What is incorrect about C?

• A C goes on Wednesday and Sunday
• B C does not do Cycling
• C C joined just before A
• D Two people joined just after C
• E All are correct