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Find the least square number which is exactly divisible by each of the numbers 3,5,6,9,15 and 20.
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Description for Correct answer: Smallest least number divisible by 6,9,15 and 20 is its L.C.M. Its LCM is 180. Therefore there is no factor to form pair of 5, so to make it a perfect square we multiply 180 with 5 to get 900.
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