Which of the given options will come in place of question mark (?) in the following...
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Which of the given options will come in place of question mark (?) in the following sequence so that it will complete the sequence?
F11R, I7P, L5N, (?), R2J
Show answer & explanation
The sequence follows a pattern across three components: (1) First letter increments by 3 positions (F→I→L→O→R); (2) Middle number decreases by 2 each time (11→7→5→3→2); (3) Last letter decrements by 2 positions (R→P→N→L→J). The missing term at position 4 must be O3L.
Step-by-step Derivation:
Analyze each component separately:
First letter (alphabetical position):
- F (6) → I (9): +3
- I (9) → L (12): +3
- L (12) → O (15): +3 ✓
- O (15) → R (18): +3 ✓
Middle number (arithmetic sequence):
- 11 → 7: −4
- 7 → 5: −2
- 5 → 3: −2 ✓
- 3 → 2: −1 ✓
Last letter (alphabetical position, descending):
- R (18) → P (16): −2
- P (16) → N (14): −2
- N (14) → L (12): −2 ✓
- L (12) → J (10): −2 ✓
The 4th term must have: first letter O, middle number 3, last letter L → O3L (Option D)