The least perfect square, which is divisible by each of 21, 36 and 66 is:
Options:
A . 213444
B . 214344
C . 214434
D . 231444
Answer: Option A L.C.M. of 21, 36, 66 = 2772. Now, 2772 = 2 x 2 x 3 x 3 x 7 x 11 To make it a perfect square, it must be multiplied by 7 x 11. So, required number = 22 x 32 x 72 x 112 = 213444
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