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
In a letter-number series, each part of the term follows its own rule, so the first letters, the numbers and the last letters are checked separately.
First letters Q, S, U, W:
Each is two letters after the one before
So the next is Y
Numbers 1, 2, 6, 21:
\(1\times1+1=2\), \(2\times2+2=6\), \(6\times3+3=21\): each is multiplied by 1, 2, 3, ... and the same number added
So the next is \(21\times4+4=\) 88
Last letters F, E, D, C:
Each is one letter before the one before it
So the next is B