1) AI, BJ, CK,? A) DL B) DM C) GH D) LM Answer: Option AExplanation: 1st letter : $A+1 \rightarrow B, B+1 \rightarrow C, C+1\rightarrow D$ 2nd letter : $I+1 \rightarrow J, J+1 \rightarrow K, K+1\rightarrow L$ Hence the answer is (a).