Coefficient of $x^3$ in $(1+x^2)(1+x)^{100}$
Coefficient of $x^{10}$ in $(1+x)^{10}(1-x)^{10}$
Coefficient of $x^n$ in $\dfrac{2+x}{2-x}$.
Any help on these would be appreciated.
Coefficient of $x^3$ in $(1+x^2)(1+x)^{100}$
Coefficient of $x^{10}$ in $(1+x)^{10}(1-x)^{10}$
Coefficient of $x^n$ in $\dfrac{2+x}{2-x}$.
Any help on these would be appreciated.