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Find the one which does not belong to that group ?

  • A.OQMS
  • B.UAWY
  • C.NPLR
  • D.BDZF

Answer: B

Compare the steps between letters, allowing the alphabet to wrap round:

  • O(15), Q(17), M(13), S(19): \( +2,\; -4,\; +6 \)
  • N(14), P(16), L(12), R(18): \( +2,\; -4,\; +6 \)
  • B(2), D(4), Z(26), F(6): \( +2,\; -4,\; +6 \)
  • U(21), A(1), W(23), Y(25): \( +6,\; -4,\; +2 \)

UAWY runs the same three steps in the opposite order, so it is the odd one out. To match the others it would have to be UWSY.

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