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Which of the following options should come in place of the question mark (?) in the given series based on the English alphabetical order? BDF, IKM, PRT, WYA,?
CFI
DGJ
CEG
DFH
DFH
Examine the positional difference between consecutive letters within each triplet (all +2) and the starting letters of successive triplets (+5).
Examine the positional difference between consecutive letters within each triplet (all +2) and the starting letters of successive triplets (+5).
Analyze the first letters of each triplet
The first letters are B (2), I (9), P (16), W (23). Each step increases by +7 positions in the English alphabet (2 + 7 = 9, 9 + 7 = 16, 16 + 7 = 23). Continuing this pattern: 23 + 7 = 30 (30 - 26 = 4), which corresponds to letter D.
Analyze the second letters of each triplet
The second letters are D (4), K (11), R (18), Y (25). Each step increases by +7 positions (4 + 7 = 11, 11 + 7 = 18, 18 + 7 = 25). Continuing this pattern: 25 + 7 = 32 (32 - 26 = 6), which corresponds to letter F.
Analyze the third letters of each triplet
The third letters are F (6), M (13), T (20), A (1). Each step increases by +7 positions (6 + 7 = 13, 13 + 7 = 20, 20 + 7 = 27 тЖТ 1, 1 + 7 = 8). Wait, let us re-verify: F(6) тЖТ M(13)=+7, M(13) тЖТ T(20)=+7, T(20) тЖТ A(1)=+7 (since 20+7=27=1st letter A). Next letter: 1 + 7 = 8, which corresponds to letter H. Hence the missing triplet is DFH.
A: CFI has incorrect starting letters. B: DGJ does not follow the +7 alphabet jump rule. C: CEG has incorrect spacing and letters.
D is correct because each letter in the sequence advances by +7 positions from the corresponding letter of the previous triplet, yielding DFH.
For multi-letter series questions, always analyze each position (1st, 2nd, 3rd) independently before combining them into triplets.
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