Lessons

General Aptitude
29.1 Square Root and Cube Root - General Questions

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Q.

The least perfect square, which is divisible by each of 21, 36 and 66 is:

View Answer

Correct choice: A

Explanation:

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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