Looking at the series: B2D, C3F, E4I, H5M, ?, Q7X
Each term has three components: a letter, a number, and another letter. Let's analyze each component separately.
First letter pattern: B, C, E, H, ?, Q
Position in alphabet: 2, 3, 5, 8, ?, 17
The differences between consecutive positions:
- C - B = 3 - 2 = 1
- E - C = 5 - 3 = 2
- H - E = 8 - 5 = 3
- ? - H = ? - 8 = 4
- Q - ? = 17 - ? = 5
So: ? = 8 + 4 = 12
The 12th letter is L.
Number pattern: 2, 3, 4, 5, ?, 7
This is a simple consecutive sequence.
The missing number is 6.
Last letter pattern: D, F, I, M, ?, X
Position in alphabet: 4, 6, 9, 13, ?, 24
The differences between consecutive positions:
- F - D = 6 - 4 = 2
- I - F = 9 - 6 = 3
- M - I = 13 - 9 = 4
- ? - M = ? - 13 = 5
- X - ? = 24 - ? = 6
So: ? = 13 + 5 = 18
The 18th letter is R.
The missing term is L6R.
Therefore, the answer is Option 2: L6R.