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Number Theory Level 4

For integers \(1\leq m,n\leq 100\), what is the number of ordered pairs of \((m,n) \) such that \(7^m + 7^n\) is divisible by 5?

625 1250 2000 7200 2500 1750 5000

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Excel in math and science

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by Sachin Vishwakarma

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