Select the option that is related to the third letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster.
RS : QT :: AK : ?
RS ==>Â (R+2) (S-2) ==> TQ ==> QT
AK ==> (A+2)Â (K-2) ==> CI ==> IC
So 'IC' will come in place of the question mark.
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