Select the Letter Cluster that can replace the question mark (?) in the following series
ROB, URE, XUH, ?, DAN
ROB ==>Â (R+3) (O+3) (B+3) ==>Â URE
URE ==>Â (U+3)Â (R+3)Â (E+3) ==>Â XUH
XUH ==>Â (X+3)Â (U+3)Â (H+3) ==> AXK
AXK ==>Â (A+3)Â (X+3)Â (K+3) ==>Â DAN
Hence 'AXK' will come in place of the question mark.
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