#### Question

The sum of n terms of three arithmetical progression are S_{1} , S_{2} and S_{3} . The first term of each is unity and the common differences are 1, 2 and 3 respectively. Prove that S_{1} + S_{3} = 2S_{2}

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Solution for question: The sum of n terms of three arithmetical progression are S1 , S2 and S3 . The first term of each is unity and the common differences are 1, 2 and 3 respectively. Prove that S1 + S3 = 2S2 concept: Sum of First n Terms of an AP. For the course CBSE