Question

Need help with combinations and permutations

Answer 1

http://prntscr.com/74kk9u

Answer 2

is that a combination or a permutation?

Answer 3

i think its a permuation

Answer 4

the albums are shuffled...so the order that you pick them does not matter

Answer 5

what does that exactly mean?

Answer 6

after you put the cd's in the player ...the player randomly pick a cd and then randomly pick a song.

Answer 7

okay

Answer 8

so it really doesn't matter what order you put the cd's in the player since they are going to be randomized

Answer 9

so do i use this formula \[\frac{ n! }{ (n-r)!}\]

Answer 10

that would be a permutation

Answer 11

order matters in a permutation

Answer 12

oh so i use combinations

Answer 13

yes

Answer 14

i don't really know the formula for combunations

Answer 15

number of permutations is r! times greater than number of combinations:)

Answer 16

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

Answer 17

\[\frac{ 13!}{ 6!(7)!}\]

Answer 18

like that?

Answer 19

yes

Answer 20

do i distribute?

Answer 21

or what?

Answer 22

distribute what?

Answer 23

the 6 to the 7

Answer 24

computer 6!,7! and 13!

Answer 25

*compute

Answer 26

13!=6227020800
6!=720
7!=5040

Answer 27

that what got

Answer 28

now compute \[\frac{13!}{6!\times 7!}\]

Answer 29

1716?

Answer 30

yes

Answer 31

awesome thanks for explaining

Answer 32

np

Answer 33

so just to recap
premutations=order matters
combunations= order doesn't matter

Answer 34

yes

Answer 35

http://prntscr.com/74kym0 so this is a permutation correct

Answer 36

yes