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$Download Lagu If \( S {n}=\sum {r=1}^{n} t {r}=\frac{1}{6} n(n+1)(n+2) \forall n ...$	If \( S {n}=\sum {r=1}^{n} t {r}=\frac{1}{6} n(n+1)(n+2) \forall n ... (PW Solutions) View
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	If `S r = \|[2r,x,n(n+1)],[6r^2-1,y,n^2(2n+3)],[4r^3-2nr,z,n^3(n+1)]\|` then `sum (r=1)^nS r` do (Doubtnut) View
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