Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
AY, BX, ?, DV, EU, FT
AY ==>Â (A+1) (Y-1)Â =Â BX
BX ==>Â (B+1) (X-1) = CW
CW ==>Â (C+1) (W-1) = DV
DVÂ ==> (D+1) (V-1) =Â EU
EUÂ ==> (E+1) (U-1)Â =Â FT
So here 'CW' will come in place of the question mark.
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