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Question

The least number that must be multiplied by 72 to make it a cube number is:


A

6

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B

2

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C

4

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D

3

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Solution

The correct option is D

3


Writing 72 as a product of prime factors, we have:

72 = 2x2x2x3x3

The prime factor 3 does not appear in a group of three.

So, the least number with which 72 must be multiplied to make it a perfect cube is 3.


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