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RE: Brainsteem Mathematics Challenges: Powers of 2018

in #mathematics7 years ago

This is a quick solve -- it reduces to finding the last 2 digits of 182018, and the last 2 digits of powers of 18 start with 181=18, and then go into a pattern of 24, 32, 76, 68, 24, 32, etc.

The cycle length is 4, the last 2 digits of 182 is 24, and 2016 is evenly divisible by 4, therefore the answer is 24.