Question: What comes in place of question mark? 35Z34, 42U36, 55P44, 64K48, ?

Identify letter pattern: Z (26), U (21), P (16), K (11) — each decreases by 5, so the next letter is F (6).

Compute left − right for each term:

• 35 − 34 = 1

• 42 − 36 = 6

• 55 − 44 = 11

• 64 − 48 = 16

These differences form 1, 6, 11, 16 — each increases by 5, so the next difference is 21.

Therefore the next term must have letter F and satisfy left − right = 21. Check the choices:

• 72F50: 72 − 50 = 22 → difference incorrect.

• 84G64: letter is G, not F → letter incorrect.

• 73U36: letter is U, not F (and numeric difference is 37) → incorrect.

• 73F52: 73 − 52 = 21 and letter is F → satisfies both patterns.

Answer: 73F52