Question Number 21802 by Tinkutara last updated on 04/Oct/17

Commented by mrW1 last updated on 06/Oct/17

Answered by ajfour last updated on 06/Oct/17
![coeff. of x^5 in ((5!)/(3!))[x+(x^2 /(2!))+(x^3 /(3!))]^3 =coeff. of x^2 in 20(1+(x/2)+(x^2 /6))^3 =20((3/6)+(3/4)) =20×(5/4)=25 .](https://www.tinkutara.com/question/Q21895.png)
Commented by Tinkutara last updated on 06/Oct/17

Commented by ajfour last updated on 09/Oct/17

Commented by mrW1 last updated on 06/Oct/17

Commented by Tinkutara last updated on 06/Oct/17

Commented by mrW1 last updated on 09/Oct/17

Commented by ajfour last updated on 09/Oct/17
