Choose the odd one out from the following.

CONCEPT

In an alphanumeric pair, assign each letter its alphabet position. The number of letters strictly between two letters is the difference of their positions minus one.

A consistent group follows the same letter-to-number rule; the odd item is the one whose suffix does not equal that intervening-letter count.

APPLICATION

1. For JR6, J = 10 and R = 18. The position gap is 18 − 10 = 8, so 8 − 1 = 7 letters lie between them, while the suffix is 6.

2. For RV3, R = 18 and V = 22. The position gap is 22 − 18 = 4, so 4 − 1 = 3 letters lie between them, matching the suffix 3.

3. For EK5, E = 5 and K = 11. The position gap is 11 − 5 = 6, so 6 − 1 = 5 letters lie between them, matching the suffix 5.

4. For DG2, D = 4 and G = 7. The position gap is 7 − 4 = 3, so 3 − 1 = 2 letters lie between them, matching the suffix 2.

CROSS-CHECK

The intervening-letter counts are 7, 3, 5, and 2, whereas the displayed suffixes are 6, 3, 5, and 2. Only JR6 breaks the common rule, so JR6 is the odd one out.