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How many two-digit positive integers have a units digit that is equal to the product of its two digits?

 Nov 15, 2022
 #1
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There are exactly 10 that work: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19

 Nov 15, 2022
 #2
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If 10 qualifies, then so must 20, 30, 40, 50, 60, 70, 80, 90  

Guest Nov 15, 2022

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