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माना की किसी समान्तर श्रेणी के n , 2n तथ...

माना की किसी समान्तर 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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