January 7, 2020
Problem of the Week
Tuesday, January 7, 2020
You received a calculator as a gift over the holidays. It has only two keys: a +1 key and a x10 key. The number 1 appears on your display. What is the fewest number of key punches that you can use to make the New Year: 2020 appear on the display? List the sequence of key punches that will get you there.