Question

In the following question, a letter-number series is given with one or more terms missing as shown by (?). Choose the missing term out of the given alternatives.

Q1F, S2E, U6D, W21C, ?

• A. Y44B
• B. Y66B
• C. Y88B
• D. Z88B

Answer 1

The correct option is C Y88B

The first letter of each term is moved two steps forward and
the last letter is moved one steps backward to obtain the corresponding letters of the next term.
The number series runs as follows :
$1\times 1+1=2$
$2\times 2+2=6$
$6\times 3+3=21$
$21\times 4+4=88$