Question

If S₁ , S₂, S₃ are the sum of n terms of three A.P's , the first term of each being unity and the respective common difference being 1 , 2 ,3 , then S₁ + S₃ =__________ ?

Answer 1

it wll 2S2 
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Answer 2

If S₁ , S₂, S₃ are the sum of n terms of three A.P's , the first term of each being unity and the respective common difference being 1 , 2 ,3 , then S₁ + S₃ =____2N ^______