"The sums of `n`terms of three arithmetical progressions are `S_1, S_2a n dS_3dot`The first term of
Channel: Doubtnut
Date: 2019-12-27

"The sums of `n`
terms of three arithmetical progressions are `S_1, S_2a n dS_3dot`
The first term of each unityand the common differences are `1,2a n d3`
respectively. Prove that `S_1+S_3=2S_2dot`"

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