In the given question, a letter-number series is given with one term missing as shown by (?). Choose the missing term out of the given alternates.
Q1F, S2E, U6D, W21C, ...? ...
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Y88B
The first letters Q, S, U, W advance by two each time, so the next is Y; the last letters F, E, D, C fall back by one, so the next is B.
The numbers 1, 2, 6, 21 follow the rule “multiply by n and add n”: 1 × 1 + 1 = 2, 2 × 2 + 2 = 6, 6 × 3 + 3 = 21, and 21 × 4 + 4 = 88. The missing term is Y88B.