Letter Series
Select the letter-cluster from among the given options that can replace the question mark (?) in the following series: WZWT, WVOH, WRGV, WNYJ, ?
Select the letter-cluster that can replace the question mark: CGK, GKO, KOS, OSW, ?
Select the letter-cluster: MIN, NJM, OKL, PLK, ?
Select the letter-cluster: BRF, EUH, HXJ, KAL, ?
Select the letter-cluster: MCFI, NEKP, OGPW, PIUD, ?