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if n is a positive integer then show that Σ { Cⁿᵣ / Cⁿᵣ-1 } =n(n+1)²(n+2) / 12
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if n is a positive integer then show that Σ { Cⁿᵣ / Cⁿᵣ-1 } =n(n+1)²(n+2) / 12 – Download YouTube to MP3 & MP4 | TubeGalore