SSC CHSL 2025 · PYQ · Number System · medium
Which of the following numbers is NOT a perfect square?
Answer
The correct answer is B: 640. 900 = 30², 441 = 21², 729 = 27². 640 is not a perfect square as √640 ≈ 25.3, which is not an integer.
- A.900
- B.640✓ Correct
- C.729
- D.441
900 = 30², 441 = 21², 729 = 27². 640 is not a perfect square as √640 ≈ 25.3, which is not an integer.
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