Asked by Sammy

1) You and 3 friends go to a concert. In how many different ways can you sit in the assigned seats?

A) 6
B) 12
C) 24
D) 10

2) You own 7 pairs of jeans and want to take 2 of them with you on vacation. In how many ways can you choose 2 pairs of jeans?

A) 60
B) 21
C) 20
D) 10

Answered by Sammy
I think the first one might be C) 24 and the second one could be D) 10. I'm not sure though, so can someone please check! Thanks!
Answered by Sammy
Can someone please help me?!?!?!?!?!
Answered by Jai
(1)
Yes it's 24, because,
4 x 3 x 2 x 1 = 24 ways

(2)
You'll choose 2 pairs of jeans from 7 pairs. Order of the items does not matter, so we'll use combinations:
nCr = n! / ( r! (n - r)! )
Thus,
7C2 = 7! / (2! (7 - 2)! )
7C2 = 21
Answered by Sammy
Thanks a bunch!!! (=
Answered by Hi
No, for #1 it starts at 3 not 4 (3x2x1 is the correct way) like you did. So it would be 6 for #1.
Answered by Sam
No, n. 1. does start at 4 because its You + 3 friends.
Answered by Sightless
well done Hi, you got it wrong
Answered by meeeeme
probability unit test answers
1. d
2. a
3. c
4. c
5. b
6. d
7. c
8. d
9. b
10. d
11. a
12. b
13. a
14. d
15. d
16. b
if i got some wrong im sorry, these were just what i got.


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