# Which of the following numbers are not perfect cubes:- A) 216 B) 128 c) 1000 D) 100 E) 46656

A) 216 = 2x2x2x3x3x3,

216 form 2 tribplet so it a perfect cube.

B) 128 = (2x2x2)x(2x2x2)x2

128 is not a perfect cube

c) 1000 = (2x2x2)(5x5x5) So, it is a perfect cube

D) 100 = (2x2)(5x5)

100 is not a perfect cube

E) 46656 = (2x2x2)x(2x2x2)x(3x3x3)x(3x3x3)

46656 is a perfect cube.

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