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CTET Paper I (Classes I to V) 12 Jan 2022 Solved Paper

Question : 33 of 150

Marks: +1, -0

Which of the following is not a perfect cube?

Solution:

Concept:

A perfect cube is a number that can be written as the product of three identical integers.

Explanation:

Check each option using factorization.

216 = 6 \times 6 \times 6

— perfect cube.

512 = 8 \times 8 \times 8

— perfect cube.

729 = 9 \times 9 \times 9

— perfect cube.

666 = 2 \times 3 \times 111

— cannot be grouped into three equal factors.

Therefore, 666 is not a perfect cube.

Answer:

C (666)

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