Select the term from among the given options that can replace the question mark (?) in the following series.

OJH 20, MHF 25, KFD 35, IDB 55, GBZ 95, ?

Given: OJH 20, MHF 25, KFD 35, IDB 55, GBZ 95, ?

Logic: The difference doubles at each step: 5, 10, 20, 40.

25 − 20 = 5

35 − 25 = 10

55 − 35 = 20

95 − 55 = 40

Next difference: 80 (40 × 2).
95 + 80 = 175.

The letter series is: OJH, MHF, KFD, IDB, GBZ, ?

Logic: Decrease by 2 each places.

First letters:

O → M → K → I → G → ?

G − 2 = E.

Second letters:

J → H → F → D → B → ?

B − 2 = Z.

Third letters:

H → F → D → B → Z → ?

Pattern: Decrease by 2 each step (cyclically through Z → A).

Z − 2 = X.

Letters: EZX

Number: 175

EZX 175 is correct answer.

Thus, correct