Single Choice

Which of the following numbers are not perfect cubes?

A64
B729
C243
D81
Correct Answer

Solution

$$\displaystyle 64=2\times 2\times 2\times 2\times 2\times 2={ 2 }^{ 3 }\times { 2 }^{ 3 }={ \left( 2\times 2 \right) }^{ 3 }$$
Therefore, 64 is a perfect cube.

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