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WAEC Mathematics 2017 Paper

Question : 36

Total: 49

⊕ 4

Solution:

Concept:

Use the modulo 5 addition and multiplication tables to check which value of

n

satisfies the equation.

Explanation:

Take

n = 3

from the options and check the expression.

From the multiplication table,

3 \otimes 4 = 12

Since

12 \equiv 2 \pmod{5}

, we have

3 \otimes 4 \equiv 2

Now from the addition table,

2 \oplus 3 = 5

Since

5 \equiv 0 \pmod{5}

, the equation is satisfied.

So the required value is

n = 3

Answer:

C. 3

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