Multinomial theorem SE1: coefficient of x^8 in (1+x^2-x^3)^9

The Multinomial Theorem

Multinomial Theorem | Binomial theorem | Concept and solved examples

Multinomial Coefficients

Probability and Statistics | Lec-2, Part B | Multinomial Theorem, multinomial coefficient | Examples

Understanding Multinomial Coefficients

State and prove multinomial theorem 

3.4.5 Multinomial Theorem: Video

[Math] Prove the Multinomial Theorem: If is a positive integer, theorem