Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
TX, ZD, FJ, LP, ?
TX ==>Â (T+6) (X+6) ==>Â ZD
ZDÂ ==> (Z+6) (D+6) ==>Â FJ
FJ ==>Â (F+6) (J+6) ==>Â LP
LP ==>Â (L+6)Â (P+6) ==> RV
Hence 'RV' will come in place of the question mark.
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