Probability is the chance or likelihood of an event occurring.
It is measured of a scale of 0 to 1.
0 means it has no chance or zero chance or is impossible to occur.
1 means it is certain to occur or is guaranteed to occur.
Chance is another word for probability. The likelihood of an event occurring.
Unlikely means the probability of an outcome is less than 0.5 (50%)
Likely means the probablility of an outcome is greater than 0.5 (50%)
Even chance or equal chance means the probability is the same for all outcomes
eg if you are flipping a coin, equally likely means 1 out of 2 or 50%
eg if you are rolling a die, equally likely means equal chance of a 1, 2, 3, 4, 5 or 6
eg The probability of rolling a six on a die is 1 out of 6 or 0.166666... or 16.67% (2dp).
This is unlikely to occur.