Question

Find n, if:

(17-n)!/(14-n)!
= 5!
​

Answer 1

Answer:

Techniques for improved soil conservation include crop rotation, cover crops, conservation tillage and planted windbreaks, affect both erosion and fertility. When plants die, they decay and become part of the soil. ... Farmers have practiced soil conservation for millennia.

Answer 2

=$\frac{(17-n)!}{(14-n)!}=5!$

we can write above equation as:

=>$\frac{(17-n)*(16-n)*(15-n)*(14-n)!}{(14-n)!}$=5!

=>$(17-n)*(16-n)*(15-n)$=120

=>(272-33n+$n^{2}$)*(15-n)=120

=>$-n^{3}$$+48n^{2}$$-769n$$+4080$=120

n=11

Thank you