NECO Mathematics 2022 Objective — Question 5
Question 5 of 50 from the National Examinations Council (NECO) Mathematics 2022 Objective paper, with the correct answer and a full explanation.
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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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