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Question

A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.

CDE, IHG, KLM, QPO, STU, ?

This question was previously asked in
SSC CGL 2017 (Tier 1) Previous Year Paper (16-Aug-2017) (Shift 1)
The correct answer is

YXW

Each term is three consecutive alphabet letters, alternating ascending and descending: CDE (asc), IHG (desc), KLM (asc), QPO (desc), STU (asc). So the next term must be descending.

The first letters are C(3), I(9), K(11), Q(17), S(19) with gaps +6, +2, +6, +2. The next gap is +6, giving 19 + 6 = 25 = Y. Writing three letters descending from Y: YXW.

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