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by Anurag@Gurome » Tue Jul 05, 2011 11:00 pm
sampath wrote:How many integers X are there between 21 and 51 inclusive such that X^3 is divisible by both 3 and 5
As x³ is divisible by both 3 and 5, x is also divisible by both 3 and 5.

Between 21 and 51 inclusive only 30 and 45 are divisible by both 3 and 5.

Hence, there 2 such integers.
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by MBA.Aspirant » Tue Jul 05, 2011 11:02 pm
a multiple of 15
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