Question

If one of the terms of the binomial expression `(x+y-3z)^n` is `A*x^3*y^4*z^2` , what is `n` ?

Answer 1

`n = 9` and `A = 11340`

Explanation:

In `(x+y-3z)^9` appears all the `x^ay^bz^c` products such that `a+b+c=9`