Given the integers $r>1$,$n>2$ and co-efficient of ${\left( {3r} \right)^{th}}$ and ${\left( {r + 2} \right)^{th}}$ term in the binomial expansion of ${\left( {1 + x} \right)^{2n}}$ are equal, then 

The coefficient of $x^2$ in expansion of the product
(2-$x^2$).($(1 + 2x + 3x^2)^6$ + $(1-1 4x^2)^6$) is :

Coefficient of $x^ {15}$ in $(1+x+x^ {3}+x^ {4})$^ {n} is

The cofficient of $x^{32}$in the expansion of $( x^4 - \frac {1}{x^3})^{15}$is

The coefficient of $x ^ { 4 }$ in the expansion of $\left( 1 + x + x ^ { 2 } + x ^ { 3 } \right) ^ { 11 }$ is