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Evan is building a positive integer. He starts with the digit 1. Each move, he adds a random digit from 0 to 9 inclusive to the end. He stops

when the integer becomes even. If the probability that the integer is a multiple of 4 is a b where a and b are relatively prime, find a + b.

 Aug 15, 2022
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a + b = 47.

 Oct 9, 2022

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