Find the odd one out.

The correct answer is RTV.

To find the odd one out, let us analyze the pattern of the letter positions in the English alphabet for each given option:

1. GIJ:

Position of G = 7

Position of I = 9 (7 + 2)

Position of J = 10 (9 + 1)

Pattern: (+2, +1)

2. TVW:

Position of T = 20

Position of V = 22 (20 + 2)

Position of W = 23 (22 + 1)

Pattern: (+2, +1)

3. CEF:

Position of C = 3

Position of E = 5 (3 + 2)

Position of F = 6 (5 + 1)

Pattern: (+2, +1)

4. UWX:

Position of U = 21

Position of W = 23 (21 + 2)

Position of X = 24 (23 + 1)

Pattern: (+2, +1)

5. RTV:

Position of R = 18

Position of T = 20 (18 + 2)

Position of V = 22 (20 + 2)

Pattern: (+2, +2)

All options except RTV follow the rule where the second letter is obtained by moving forward by 2 positions and the third letter is obtained by moving forward by 1 position (+2, +1). RTV follows the pattern (+2, +2), making it the odd one out.