11.If S1 , S2 , S3 be the sum of 3 Arthemetic series, first term of each being 1 and the respective common differences are 1,2 and 3, then prove that S1 + S3 = 2S1S3

11.If S1 , S2 , S3 be the sum of 3 Arthemetic series, first term of ea

1.	11.If S1 , S2 , S3 be the sum of 3 Arthemetic series, first term of each being 1 and the respective common differences are 1,2 and 3, then prove that S1 + S3 = 2S1S3
Answer» 11.If S1 , S2 , S3 be the sum of 3 Arthemetic series, first term of each being 1 and the respective common differences are 1,2 and 3, then prove that S1 + S3 = 2S1S3