Find the simallest perfect square divisible by 3, 4, 5 and 6
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L.C.M. of 3, 4, 5, 6 = 2 x 2 x 3 x 5 = 60
in which 3 and 5 are not in pairs L.C.M. = 2 x 3 x 2 x 5 = 60
We should multiple it by 3 x 5 i.e. by 15
Required perfect square = 60 x 15 = 900
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