Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
XJ, AG, DD, GA, ?
XJ ==>Â (X+3) (J-3) ==>Â AG
AG ==>Â (A+3) (G-3) ==> DD
DD ==> (D+3) (D-3) ==> GA
GA ==> (G+3) (A-3) ==> JX
Hence 'JX' will come in place of the question mark.
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