Select the letter-cluster that can replace the question mark (?) in the following series.
RAB, SZD, TYF, UXH, ?
RAB ==>Â (R+1) (A-1) (B+2)Â ==> SZD
SZDÂ ==> (S+1) (Z-1) (D+2)Â ==>Â TYF
TYFÂ ==> (T+1) (Y-1) (F+2)Â ==>Â UXH
UXHÂ ==> (U+1) (X-1) (H+2)Â ==> VWJ
Hence 'VWJ' will come in place of the question mark.
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