Three of the following four letter groups are alike in a certain way. Choose the one that does not belong to the group.
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → BGKM
Write each letter's place in the alphabet (A = 1, …, Z = 26) and find the jumps; after Z the count goes on from A.
Option (1) IMQU — I (9), M (13), Q (17), U (21): jumps +4, +4, +4.
Option (2) SWAE — S (19), W (23), then 4 places on is A (27 − 26 = 1), then E (5): jumps +4, +4, +4.
Option (3) UYCG — U (21), Y (25), then 4 places on is C (29 − 26 = 3), then G (7): jumps +4, +4, +4.
Option (4) BGKM — B (2), G (7), K (11), M (13): jumps +5, +4, +2.
Three groups move 4 letters at every step; BGKM does not, so BGKM is the odd one out.