What will come in place of the question mark (?) in the following letter series? R, U, X, A, ? MCQ with Answer and Explanation

Explanation:
The middle letters follow the order A, B, C, D, E. The first and third letters are in alphabetical order starting with G. So, the missing term is OEP.[reference:12]

Explanation:
First letters: U, Y, C, G, K (+4, wrapping around). Second letters: W, A, E, I, M (+4, wrapping around). The next term is KM.

Explanation:
First: F, L, R, X, D (+6 each, wrap). Second: I, O, U, A, G (+6 each, wrap). So DG.