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The sums of n terms of three arithmetic...

The sums of `n` terms of three arithmetical progressions are `S_1, S_2`and `S_3dot` The first term of each unity and the common differences are `1,2` and `3` respectively. Prove that `S_1+S_3=2S_2dot`

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RD SHARMA ENGLISH-ARITHMETIC PROGRESSIONS-All Questions
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