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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, EGI, HJL, KMO,?
NPR
NPS
MQS
NPT
NPR
Observe the first letters B, E, H, K,... which follow a +3 gap (B+3=E, E+3=H, H+3=K, K+3=N). Each subsequent letter in the triplet also follows a +3 gap from the previous one.
Observe the first letters B, E, H, K,... which follow a +3 gap (B+3=E, E+3=H, H+3=K, K+3=N). Each subsequent letter in the triplet also follows a +3 gap from the previous one.
Analyze the first letters of each cluster
The first letters are B(2), E(5), H(8), K(11). The pattern is +3: 2+3=5, 5+3=8, 8+3=11. Continuing this, 11+3=14, which corresponds to N.
Analyze the second letters of each cluster
The second letters are D(4), G(7), J(10), M(13). The pattern is +3: 4+3=7, 7+3=10, 10+3=13. Continuing this, 13+3=16, which corresponds to P.
Analyze the third letters of each cluster
The third letters are F(6), I(9), L(12), O(15). The pattern is +3: 6+3=9, 9+3=12, 12+3=15. Continuing this, 15+3=18, which corresponds to R.
B: NPS is wrong as the last letter is P (16) instead of R (18); C: MQS is wrong as the first letter M is 13 instead of 14 (N); D: NPT is wrong as the last letter T is 20 instead of 18 (R).
A is correct because the series follows a consistent +3 increment for each position in the triplet, resulting in N(14), P(16), R(18).
When solving alphabetical clusters, always convert letters to their numerical positions (A=1, B=2... Z=26) to quickly identify the gap pattern.