1. 

In the following question, a letter series is given. Some of the letters of the series are missing. This missing letters are given in same order as one of the four / five alternatives below the series. Find out the correct alternative.

P__R__S__QPR__
A. QPRS
B. QRPS
C. QRPP
D. QPSR

Answer: Option B

Explanation:

Pattern of the series as shown below

PQRRS/PQRRS => QRPS

Hence, the missing letters are QRPS.