Discussion
Find the one which does not belong to that group ?
Answer: C
All four are perfect cubes, so look at the roots.
\[ 8 = 2^{3}, \quad 27 = 3^{3}, \quad 64 = 4^{3}, \quad 125 = 5^{3} \]
The roots 2, 3 and 5 are prime; 4 is composite.
So 64 does not belong.
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