NABTEB Mathematics 2022 Objective — Question 5

Question 5 of 50 from the National Business and Technical Examinations Board (NABTEB) Mathematics 2022 Objective paper, with the correct answer and a full explanation.

Evaluate 23 x 54(mod 7).

A. 2
B. 3Correct
C. 9
D. 8

Explanation

(p o q) mod x = [(p mod x)(q mod x)] mod x. 23 mod 7 = 2, 54 mod 7 = 5. (2x5) mod 7 = 10 mod 7 = 3.

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