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What should come in place of the question mark (?) in the given series based on the English alphabetical order? HLP, TXB, FJN, RVZ, DHL, ?
PTY
QTY
QSX
PTX
PTX
Observe the first letters of the clusters: H, T, F, R, D. They follow a pattern of +12 or -14 (mod 26), then the subsequent letters in each cluster increment by +4.
Observe the first letters of the clusters: H, T, F, R, D. They follow a pattern of +12 or -14 (mod 26), then the subsequent letters in each cluster increment by +4.
Analyze the first letter of each cluster
H(8), T(20), F(6), R(18), D(4). Pattern: 8+12=20, 20-14=6, 6+12=18, 18-14=4. Following +12, 4+12=16. The 16th letter is P.
Analyze the second letter of each cluster
L(12), X(24), J(10), V(22), H(8). Pattern: 12+12=24, 24-14=10, 10+12=22, 22-14=8. Following +12, 8+12=20. The 20th letter is T.
Analyze the third letter of each cluster
P(16), B(2), N(14), Z(26), L(12). Pattern: 16-14=2, 2+12=14, 14+12=26, 26-14=12. Following +12, 12+12=24. The 24th letter is X.
A: PTY ends with Y(25) instead of X(24). B: QTY starts with Q(17) instead of P(16). C: QSX starts with Q(17) instead of P(16).
D is correct because the series follows a repeating pattern of +12 and -14 for each position in the clusters, resulting in P(16), T(20), and X(24).
For alphabetical series, always convert letters to their numerical positions (1-26) first; this makes identifying (+/-) patterns significantly faster than visual inspection.
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