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Question - Sum of the First 'N' Terms of an Arithmetic Progression

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ConceptSum of the First 'N' Terms of an Arithmetic Progression  

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

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