Question

The value of expansion ( sum r=9 ^ 30 (-1)^ r , 30 C r 3^ t )is​

Answer 1

Step-by-step explanation:

let s= {r=16^30(r+2)(r-3)={r=1^30(r+2)

(r-3)-{r=1^15(r+2)(r-3)={r=1^30(r^2-r-6)-{r=1^15(r^2-r-6)