Find the missing group of letters in the following series: BC, FGH, LMNO, ______ A. TUVWX B. UVWXY C. STUVW D. RSTUV

GATE 2018 · General Aptitude · Sequence Series · medium

Answer: UVWXY

1. Map group positions in the alphabet: BC: positions 2-3. FGH: positions 6-8. LMNO: positions 12-15. Group sizes: 2, 3, 4 -- next group has 5 letters.
2. Calculate skips between groups: After BC(ends 3): skip D,E -> 2 skipped, next starts F(6). After FGH(ends 8): skip I,J,K -> 3 skipped, next starts L(12). After LMNO(ends 15): skip pattern gives U(21). Skip = 5 letters: P,Q,R,S,T -> next starts U(21).
3. Form the 5-letter group starting at U: U(21), V(22), W(23), X(24), Y(25) -> UVWXY.