Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
RN, NP, JR, ?, BV
RN ==>Â (R-4) (N+2) ==>Â NP
NP ==>Â (N-4) (P+2) ==>Â JR
JR ==> (J-4) (R+2) ==> FT
FTÂ ==> (F-4) (T+2) ==>Â BV
Hence 'FT' will come in place of the question mark.
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