Find the odd one from the given options which is different from others.

T-F

The correct answer is Option (2) → T-F

Let's calculate the sum of the positions for each pair:

1. P - K:
• $P = 16$
• $K = 11$
• Sum: $16 + 11 = 27$ (Opposite letters)
2. T - F:
• $T = 20$
• $F = 6$
• Sum: $20 + 6 = 26$ (Not opposite letters)
3. O - L:
• $O = 15$
• $L = 12$
• Sum: $15 + 12 = 27$ (Opposite letters)
4. R - I:
• $R = 18$
• $I = 9$
• Sum: $18 + 9 = 27$ (Opposite letters)

Conclusion:

All pairs except T-F consist of letters that are opposites of each other in the alphabet. The opposite of T is G ($20 + 7 = 27$), and the opposite of F is U ($6 + 21 = 27$).

The odd one is T-F.