Question

In how many ways can 2 singers be selected from 4 who came to an audition?

Answer 1

do u know permutations and combinations?

Answer 2

sort of

Answer 3

I studied them but i guess I forgot

Answer 4

so..which one do u think we must use here..

Answer 5

combinations

Answer 6

yeah! correct

Answer 7

in nCr what is n?

Answer 8

The variable/

Answer 9

well..what does it represent?

Answer 10

4

Answer 11

yeah..we are choosing "r" items out of "n"..so here n is 4 and r is?

Answer 12

so 2 then? because we need 2 out of 4

Answer 13

yes! so all u need to find is 4C2 do u know the expansion?

Answer 14

n! / (r! [n-r]!)

Answer 15

yes so put the values..

Answer 16

ok so 4! / (2! [4-2]!)

Answer 17

yes!

Answer 18

awesome!

Answer 19

so the answer is?

Answer 20

can u simplify?

Answer 21

6

Answer 22

check again..

Answer 23

ohhhhhh

Answer 24

thanks dude.

Answer 25

so final answer is 12

Answer 26

I have one more question lemme post it