Number System · Question 24 · Medium
A number leaves a remainder of 4 when divided by 7. What remainder will the square of the number leave when divided by 7?
- 4
- 2
- 1
- 16
Answer and explanation
Answer: B. 2
Explanation: If n = 7k + 4, then n² leaves the same remainder as 4² = 16. Since 16 = 7 × 2 + 2, the remainder is 2.
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