In what modulus is it true that 9 8 5 - WAEC Mathematics 2014 Question
In what modulus is it true that 9 + 8 = 5?
A
mod 10
B
mod 11
C
mod 12
D
mod 13
correct option: c
9 + 8 = 17
17 + mod 12 = 1 rem 5
it is mod 12
17 + mod 12 = 1 rem 5
it is mod 12
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