B, D, F, H, ? — Number & Letter Series Aptitude Question
B, D, F, H, ?: Find the next letter: B, D, F, H, ? Answer and worked solution on CodeKairo.
- Topic: Number & Letter Series
- Section: Logical Reasoning
- Difficulty: Easy
- Time target: 40 seconds
Question
Find the next letter:
B, D, F, H, ?
Options
- I
- J
- K
- L
Show the answer and the worked solution
Correct answer: B. J
Worked solution
- Positions: 2, 4, 6, 8 — rising by 2.
- Next = 10 = J.
Answer: J.
The idea
Turn letters into numbers (A = 1 … Z = 26), find the numeric rule, then convert back. The landmarks E = 5, J = 10, O = 15, T = 20 speed this up.
Shortcut. Skip one letter each time: B (c) D (e) F (g) H (i) J — the letter skipped after H is I, so the answer is J.
Common trap. I — taking the letter straight after H; the step is + 2, so I is the letter skipped, not the answer.