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Railways PYQCBT 1 2020

RRB NTPC · Question 64

The smallest square number which is exactly divisible by 12, 15 and 18 is:

  1. 1225

  2. 625

  3. 400

  4. 900

Show answer & explanation

Answer: (D) 900

Explanation

LCM(12, 15, 18) = 180 = 2² × 3² × 5. To make it a perfect square multiply by 5: 900 = 30².