In the following question, select the odd letter group from the given…

Concept: In a letter-group classification question, each three-letter group is checked against a shared positional rule linking its opening and closing letters — such as a fixed forward shift by a set number of places along the alphabet, treated cyclically so the sequence wraps from Z back to A. The group whose opening-to-closing shift does not match the shift shared by the other groups is the odd one out.

1. Assign each letter its position: A = 1 … Z = 26.

2. AZF: opening letter A (1), closing letter F (6); shift = +5.

3. LOQ: opening letter L (12), closing letter Q (17); shift = +5.

4. EVJ: opening letter E (5), closing letter J (10); shift = +5.

5. ZAC: opening letter Z (26), closing letter C (3); moving forward cyclically from Z by +5 would land on E, not C — the actual shift from Z to C is only +3.

6. Three groups share the same +5 forward shift; only ZAC deviates, so ZAC is the odd letter group.

Cross-check: the middle letter of every group also mirrors the opening letter about the centre of the alphabet (opening position + middle position = 27) in all four groups — AZF, LOQ, EVJ, and ZAC alike — so that relationship does not distinguish them. The real discriminator is the +5 forward-shift rule, and it isolates ZAC uniquely.