Mathematics, 16.08.2021 03:50 cheyenneisaboss22

The divisibility rule for 7 says 10a + b is a multiple of 7 if only and only if a - 2b is a multiple of 7 Explain.

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The divisibility rule for 7 says 10a + b is a multiple of 7 if only and only if a - 2b is a multiple...