Question

What is the value of 5p1?

Answer 1

Hint:

\[\Large _nP_r = \frac{n!}{(n-r)!}\]

Answer 2

wait what's n and r??

Answer 3

that's the general formula

Answer 4

in this case, n = 5 and r = 1

Answer 5

oh okay thank you!!

Answer 6

so

\[\Large _nP_r = \frac{n!}{(n-r)!}\]

becomes

\[\Large _5P_1 = \frac{5!}{(5-1)!}\]

Answer 7

Thank you but what does the exclanation ! mean how do you figure that out?

Answer 8

oh sry, i should have clarified

Answer 9

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

So 5! = 5*4*3*2*1

Answer 10

Basically you start with the given number and you multiply it by every integer smaller than it til you get to 1

Answer 11

Ok thanks!

Answer 12

you're welcome