Select the option that is related to the fifth letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster and the fourth letter-cluster is related to the third letter-cluster.
ABC6 : DEF15 :: GHI24 : JKL33 :: PQR51 : ?
ABC6 ==> (A+3) (B+3)Â (C+3) (6+9)Â ==>Â DEF15
GHI24Â ==>Â (G+3)Â (H+3)Â (I+3) (24+9)Â ==>Â JKL33
PQR51 ==>Â (P+3)Â (Q+3)Â (R+3)Â (51+9) ==> STU60
So 'STU60' will come in place of the question mark.
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