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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?

 May 22, 2021
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There are 4025 ways Andrew and Mary could have chosen their numbers.

 May 22, 2021

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