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A set of 25 two digit numbers are listed below 10,17,20,23,24,28,32,39,42,25,26,52,55,58,61,65,66,72,75,78,79,85,94,97,98.

What is the probability of the sum of the number's digits is odd?

 Feb 21, 2021
 #1
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Here are the sums of the digits of the numbers you listed in order:

 

1, 8, 2, 5, 6, 10, 6, 12, 6, 7, 8, 7, 20, 13, 7, 11, 12, 9, 12, 15, 16, 13, 13, 16, 17

 

Count the ones that are odd.

 Feb 21, 2021

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