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SSC CHSL 2025 · PYQ · Number System · medium

Which of the following numbers is NOT a perfect square?

  1. A.900
  2. B.640✓ Correct
  3. C.729
  4. D.441

Explanation

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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