A binary operation ⊗ is defined by m⊗n=mn+m−n on the set of real numbers, for all m, n ∈ R. Find the value of 3 ⊗ (2 ⊗ 4).

by | Jan 5 | Mathematics WAEC | 0 comments

A. 6
B. 25
C. 15
D. 18

Correct Answer: Option C

C. 15

Explanation

m⊗n=mn+m−n
3 ⊗ (2 ⊗ 4)

2 ⊗ 4 = 2(4) + 2 – 4 = 6

3 otimes 6 = 3(6) + 3 – 6 = 15

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