Question

Coefficient of x^18 in (1-x^3)9​

Answer 1

Answer:

facorization of (1-x^3)^9=(1-9x^3+36x^6-84x^9+126x^15+84x^18-36x^21+9x^24-x^27)

Step-by-step explanation:

hence Coefficient of (x^18) is 84.

I hope it helps.