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Three of these numbers are perfect cubes and one is not. Which is the odd one out: 8, 27, 64, 81?

Competition practiceAnalogy & Classification

A8
B27
C64
D81

Step-by-Step Solution

8 =

2^{3}, 27 = 3^{3}

and

64 = 4^{3}

are perfect cubes;

81 = 3^{4}

(or

9^{2}

) is not a perfect cube.

Answer: D) 81

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