Complete the series: I2Z, K4X, M7V, O11T, ______, S22P

AQ16R ✓ Correct

BQ16P

CR15P

DR15T

Correct answer: (A) Q16R

Explanation

The missing block is Q16R.

First letters step by +2 : I, K, M, O, Q, S, so this one starts with Q.

The numbers are 2, 4, 7, 11, ?, 22 with gaps +2, +3, +4, +5, +6.

So the middle number = 11 + 5 = 16.

Last letters step by -2 : Z, X, V, T, R, P, giving R here.

Combining gives Q16R.

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