SSC CGL (Prelims) General: Number and Letter Series questions with solutions

Q1. Select the letters from among the given options that can replace the question marks (?) in the following series: K, M, O, ?, S, U, ?, Y

1. Q, X
2. Q, W
3. P, W
4. R, W

Answer: Q, W

The letters follow an alternate pattern of skipping one letter each time: K, M, O, Q, S, U, W, Y. So the missing letters are Q and W.