Question

The smallest five digit number which is divisible by 12,18 and 21 is:

Answer 1

The smallest number divisible by each one of 12, 18 &21 is equal to Lcm of 12 , 18 and 21 =252
The prime factorisation of 252 = 2x2x3x3x7
Clearly to make it a perfect sq it must be multiplied by 7
252x7=1764
The smallest number =1764

Answer 2

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