| | Question 4

Find the least perfect square number which when divided by 4, 6, 7, 9 gives remainder zero.
(A) 42
(B) 40
(C) 36
(D) 32


Answer: (A)

Explanation: Find the LCM for 4, 6, 7, 9
LCM= 22 * 32 * 7 = 252
To become perfect square all factors should be in power of 2.
So, multiply it by 7
LCM = 22 * 32 * 72 = 1764
And it is perfect square of 42.

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