[" 3.माना कि किसी समांतर श्रेणी के "n,2n...

[" 3.माना कि किसी समांतर श्रेणी के "n,2n," तथा "3n" पदों का योगफल क्रमशः "S_(1),S_(2)" तथा "S_(3)" है "],[" तो दिखाइए कि "S_(3)=3(S_(2)-S_(1))]

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S_(n+3)-3S_(n+2)+3S_(n+1)-S_(n)=0

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