Query about question "$a$ and $b$ are positive integers. Which unit digit(s) of $a$..." [272]

GRE GRE Quant Problem Solving
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https://www.gregmat.com/problems/quant?problem=a-and-b-are-positive-integers-which-unit-digits-of-a

I’m not sure I fully understand the question or your approach. Why are you testing for b=9 / b=10?

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Do you have an approach in mind instead? Maybe we can build off that instead

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