What is a simple way to find 12 mod 7 + 12 mod 7 + 12 mod 7 + 12 mod 7?

1 answer:

3 0

12 ≡ 7 + 5 ≡ 5 (mod 7)

12 + 12 + 12 + 12 ≡ 4•12 ≡ 4•5 ≡ 20 ≡ 14 + 6 ≡ 6 (mod 7)

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