In what modulus is it true that 9 + 8 = 5?

In what modulus is it true that 9 + 8 = 5?
  • A.
    mod 10
  • B.
    mod 11
  • C.
    mod 12
  • D.
    mod 13
Correct Answer: Option C
Explanation

9 + 8 = 17
17 + mod 12 = 1 rem 5
it is mod 12

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