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If n = 2 (mod 7), find the remainder when (n + 2)(n + 4) is divided by 7.

 Sep 26, 2021
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If n = 2 (mod 7), find the remainder when (n + 2)(n + 4) is divided by 7.

 

n==7 + 2 ==9

 

[9 + 2] * [9 + 4] mod 7 ==[11] * [13] mod 7 ==143 mod 7 ==3 - the remainder.

 Sep 27, 2021

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