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Find the one which does not belong to that group ?

  • A.8
  • B.27
  • C.64
  • D.125

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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