Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
WUE, XXG, YAI, ?
WUE ==> (W+1) (U+3)Â (E+2) ==>Â XXG
XXGÂ ==> (X+1) (X+3) (G+2) ==>Â YAI
YAI ==> (Y+1) (A+3) (I+2)Â ==> ZDK
Hence 'ZDK' will come in place of the question mark.
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