How to find the coefficients of the specific power of x such as x^15 or x^17 in the expansion (x^1 + x^2 + x^3 x^4 + x^5 + x^6)^n?
Finding the coefficients of the power of x
How to find the coefficients of the specific power of x such as x^15 or x^17 in the expansion (x^1 + x^2 + x^3 x^4 + x^5 + x^6)^n?