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25 July, 04:05

Prove the divisibility of the following numbers by 7

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  1. 25 July, 04:22
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    5^5 mod 7 = 3

    5^4 mod 7 = 2

    5^3 mod 7 = 6

    3 - 2 + 6 mod 7 = 0

    Therefore, 5^5 - 5^4 + 5^3 mod 7 = 0 and that sum is divisible by 7.
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