Choose the missing term out of the given alternatives:

B2D, C3F, E4I, H5M, ?, Q7X

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.

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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.

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Number pattern: 2, 3, 4, 5, ?, 7

This is a simple consecutive sequence.

The missing number is 6.

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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.

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The missing term is L6R.

Therefore, the answer is Option 2: L6R.