Select the term that will complete the following letter series.
QN, RP, TS, WW, _____, FH
QN ==>Â (Q+1) (N+2) ==> RP
RP ==> (R+2) (P+3) ==> TS
TS ==>Â (T+3)Â (S+4) ==> WW
WW ==>Â (W+4) (W+5) ==> AB
ABÂ ==>Â (A+5) (B+6) ==> FH
Hence 'AB' will come in place of blank.
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