Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
MN, NM, OL, PK, ?
MN ==>Â (M+1) (N-1) ==> NM
NMÂ ==>Â (N+1)Â (M-1) ==> OL
OLÂ ==> (O+1) (L-1) ==> PK
PKÂ ==> (P+1) (K-1) ==> QJ
Hence 'QJ' will come in place of the question mark.
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