Find the least square number which is exactly divisible by one of the number 12 15 18
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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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