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WBCS Preliminary Examination 2016 — General Studies · Question 161 of 200

Q161
ArithmeticNumber System, LCM/HCF & Divisibility
What is the least number to be added to 1500 to make it a perfect square?
  1. a.12
  2. b.15
  3. c.21
  4. d.25

Answer: (C) 21

$\sqrt{1500} \approx 38.7$. $39^2 = 1521$. So 1521 − 1500 = 21 must be added.

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What is the least number to be added to 1500 to make it a perfect s… — WBCS Preliminary Examination 2016 Q161 | Prostuti360°