Question

Find general term in the expansion of ${(x_1+x_2+\dots .+x_p)}^n$

Answer 1

the general term in the expansion of $(x_1+x_2+\cdots +x_p{)}^n$ is $\frac{n!}{n_1!n_2!\cdots n_p!}{x}_1^{n_1}{x}_2^{n_2}\cdots x_p^{n_p}$