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
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
Answers
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
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.
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.