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Andrew chooses a number from 1 to 100, and Mary also chooses a number from 1 to 100. (They may choose the same number.) It turns out that the product of their numbers is a multiple of 5. In how many ways could Andrew and Mary have chosen their numbers?

 Sep 4, 2021
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Since repeats are allowed, then there are:

 

100 x 100 ==10,000 2-digit products.

 

It turns out that there are: 3,600 ways of getting a multiple of 5 out the total of 10,000 outcomes.

 Sep 5, 2021

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