Letter and Symbol Series - Verbal and Reasoning

Directions to SolveIn these series, you will be looking at both the letter pattern and the number pattern. Fill the blank in the middle of the series or end of the series.
Q1:

CMM, EOO, GQQ, _____, KUU

A GRR

B GSS

C ISS

D ITT

ANS:C - ISS

Explanation: The first letters are in alphabetical order with a letter skipped in between each segment: C, E, G, I, K. The second and third letters are repeated; they are also in order with a skipped letter: M, O, Q, S, U.