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Find the least square number which is exactly divisible by 10,12,15 and 18.

A. 999

B. 900

C. 899

D. 987

Correct Answer : B.


       L.C.M. of 10, 12, 15, 18 = 180. Now, 180 = 2 * 2 * 3 * 3 *5 = 22 * 32 * 5.


       To make it a perfect square, it must be multiplied by 5.


        Required number = (22 * 32 * 52) = 900.

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