Question

@amistre64
How would you put
(n-4)(n-3)(n-2) into factorial form, i am soo confusedddd

Answer 1

do you know what factorial form is? what a factorial is defined to look lke?

Answer 2

yes, it has a "!" at the end of a term

Answer 3

well yeah, but rather, how do we define n! ??

Answer 4

n!=n(n-1)(n-2)(n-3)...3*2*1

Answer 5

lets use that then, since we have n-2, n-3, and n-4

Answer 6

if we start with (n-2)! and divide it by some (n-r)! what would r have to be?

Answer 7

uh, is it 5

Answer 8

yep

Answer 9

\[\frac{(n-2)!}{(n-5)!}=(n-2)(n-3)(n-4)\]

Answer 10

thanks :D

Answer 11

good luck :)

Answer 12

actually i have one more question

Answer 13

In how many ways can he flag that has 3 sections be coloured if you have nine colours to choose from? Adjacent regions cannot have th

Answer 14

I did 9P3, but im not sure if its right