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Find the one which does not belong to that group ?

  • A.508
  • B.328
  • C.608
  • D.148

Answer: C

Compare the digit sums.

\[ 508 \to 5+0+8 = 13, \qquad 328 \to 3+2+8 = 13, \qquad 148 \to 1+4+8 = 13 \]

\[ 608 \to 6+0+8 = 14 \]

So 608 does not belong - the only one whose digits do not add to 13.

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