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) → RQP
Write each letter as its place in the alphabet and compare the second and third letters with the first.
Option (1) BCA — B (2), C (3), A (1): first letter, next letter, then the letter before the first (+1, then −2).
Option (2) HIG — H (8), I (9), G (7): +1, then −2.
Option (3) NOM — N (14), O (15), M (13): +1, then −2.
Option (4) RQP — R (18), Q (17), P (16): −1, then −1, three letters in backward order.
Three groups follow +1, −2; RQP goes backward one letter at a time, so it is the odd one out.