Find the least square number which is exactly divisible by 10,12,15 and 18.
Options:
A . 800
B . 600
C . 700
D . 900
Answer: Option D
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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