Question

In how many ways can a committee of three be selected from 12 students?
In how many ways can a president, secretary, and treasurer be chosen from 12 students?

answer following..

Answer 1

a ) 12c3 = 220
b) 12x11x10 = 1320 ... that seems wrong

Answer 2

what did you do for the second one?

Answer 3

first one is right btw

Answer 4

multiplication principle :S i'm not really sure. i'm getting really confused with when to use nCr and when not too..ok thank you

Answer 5

well second one is right too lol

Answer 6

it is ?

Answer 7

yup

Answer 8

12P3 = 1320

Answer 9

P = permutations with is just like the 12! thing? sorry if i make no sense :P

Answer 10

P means permutation

Answer 11

the ! thing is factorial

Answer 12

ok....okay thank you!

Answer 13

just good to know i'm not totally wrong

Answer 14

you're welcome

Answer 15

feels good doesnt it ;)

Answer 16

yes considering i appear to be getting a lot of these wrong :P hahah thanks