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Q.

Which of the following is not a perfect cube?

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a

216

b

512

c

128

d

729

answer is C.

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Detailed Solution

216 = 6x6x6

512 = 8x8x8

729 = 9x9x9

128 = 2x2x2x2x2x2x2

therefore 128 is not a perfect cube

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