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## Homework Statement

Sum the following series to N terms:

[tex]C_0^2-2C_1^2+...+(-1)^n(n+1)C_n^2[/tex]

Arrgh! This is a very frustrating question. I have to multiply two series and find the coefficient of some term but I dont know what to do. Please dont ask me to give you some proof of my work at this point of time.

## Homework Equations

[tex](1+x)^n=C_0+C_1x+C_2x^2...Cnx^n[/tex]