Select the wrong term in the given alpha-numeric series.

Y17, A34, C51, F68, G85

Y17, A34, C51, F68, G85

Logic: Each letter increased +2 and number increased +17.

Letter: Y +2 → A, A +2 → C, C +2 → E $$\not=$$ F, E +2 → G

Number: ​17 +17 → 34+17 → 51+17 → 68 +17 → 85

So, F68 is wrong because it breaks the letter and number sequence, which otherwise follows a regular forward pattern.

Thus, the correct option is: (c)