Find the smallest number which should be added to the smallest number divisible by 6, 9 and 15 to make is a perfect square.
Explanation:
The smallest number divisible by 6, 9 and 15 = LCM (6, 9, 15) = 90
A perfect square just higher than 90 is 100. Hence, 10 must be added to make it a perfect square.
Hence, option (a).
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