- #1
ritwik06
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Homework Statement
[tex]\sum^{n}_{r=0} (2r+1) (^{n} C_{r})^{2}[/tex]
The Attempt at a Solution
[tex]x(1+x^{2})^{n}[/tex]
If I differentiate this and put x=1;
I will get the above series without the squares of the binomial coefficients.Will multiplying by [tex](1+x)^{n}[/tex] help now?