Choose the missing term out of the given alternatives: B2D, C3F, E4I,…

The correct answer is Option (2) → L6R

Let us examine the pattern term by term.

Series:
B2D, C3F, E4I, H5M, ?, Q7X

Step 1: Middle numbers

2, 3, 4, 5, ?, 7 → clearly increasing by +1
So the missing number is 6.

Step 2: First letters

B (2), C (3), E (5), H (8), ?, Q (17)

Positions:
2 → 3 → 5 → 8 → 12 → 17
Increments: +1, +2, +3, +4, +5

So the missing position is 12, which is L.

Step 3: Last letters

D (4), F (6), I (9), M (13), ?, X (24)

Positions:
4 → 6 → 9 → 13 → 18 → 24
Increments: +2, +3, +4, +5, +6

So the missing letter is R (18).

Missing term = L6R