1.

Find the smallest number which is divisible by 12, 15, 20 and also is a perfect square?1. 16002. 9003. 36004. 400

Answer» Correct Answer - Option 2 : 900

Calculation:

LCM of 12, 15 and 20 by prime factorization method

12 = 2 × 2 × 3

15 = 3 × 5

20 = 2 × 2 × 5

LCM = 2 × 2 × 3 × 5

⇒ 60

The smallest number which is divisible by 60 and is a perfect square = 60 × 15

⇒ 900

∴ The required number is 900



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