Question

You volunteer to help drive children at a charity event to the zoo, but you can fit only 6 of the 15 children present in your van. How many different groups of 6 children can you drive?

Answer 1

use the formula

n C r = (n!)/(r!*(n-r)!)

where in this case, n = 15 and r = 6

Answer 2

tell me what you get

Answer 3

sweet thanks

Answer 4

sure thing

Answer 5

i got 5005

Answer 6

you are 100% correct

Answer 7

sweet!! next question

Answer 8

There are 6 performers who will present their comedy acts this weekend at a comedy club. One of the performers insists on being the last stand-up comic of the evening. If this performer's request is granted, how many different ways are there to schedule the appearances?

Answer 9

one insists to be last, so that slot is taken

you have 6-1 = 5 slots left to be filled with 5 performers

Answer 10

order matters so there are 5 P 5 = (5!)/((5-5)!) = ??? ways

Answer 11

tell me what you get

Answer 12

120?

Answer 13

yep

Answer 14

yes!

Answer 15

an alternative is to compute 5! = 5*4*3*2*1 = 120

Answer 16

im finally getting this

Answer 17

that's great

Answer 18

glad it's all clicking now

Answer 19

ive been working on this for the past month. thank you so much!!

Answer 20

hmm maybe it just takes a month for things to settle into place?

Answer 21

but glad to be of help

Answer 22

haha thank you! im taking an online class so i have teach myself everything. its been crazy

Answer 23

I'm sure you have a teacher to go to though right?

Answer 24

yeah.. but i cant actually go see here. im a visual learner...

Answer 25

like if you have any questions

Answer 26

lol who isn't really, I know I am

Answer 27

exactly

Answer 28

you can at least contact the teacher though right?