A certain number when divided by 39 leaves a remainder 20, what is the remainder when the same number is divided by 13?

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1. Remainder = 7

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2. when know that 13 is factor of 39 so it will also not be able to divide it differently. so the remainder will be same 20 but as we know that 20 is greater then 13 so we can divide it once again and in the casE of 13 the remainder will be 20-13=7

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