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

Mathematics WAEC 2014

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

  • mod 10
  • mod 11
  • mod 12 checkmark
  • mod 13

The correct answer is: C

Explanation

9 + 8 = 17

17 + mod 12 = 1 rem 5

it is mod 12
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