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gavinksong

Digit Patterns

Question

This is a variant of BMAD's recent post on the probability of choosing a natural number with a 1 in the digits.

From the set of all natural numbers...

1) What is the probability of choosing a natural number whose digits sum to an even number?

2) What is the probability of choosing a natural number whose digits sum to a number divisible by N?

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0.5


the digit sum will be either odd or even with equal probability

 

1/N


All numbers have equal probability

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