Find the smallest square number that is divisible by 6,18 and 21
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The smallest no divisible by these three no.s is 126 but since it is not a prfect square we are moving on.
We will start finding multiples of 126
126*1=126
126*2=252
126*3= 378
126*4=504
126*5=630
126*6=756
126*126= 15876
Hence the answer is 15876
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