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
8 answers
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!
Can someone please help me?!?!?!?!?!
(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
Thanks a bunch!!! (=
No, for #1 it starts at 3 not 4 (3x2x1 is the correct way) like you did. So it would be 6 for #1.
No, n. 1. does start at 4 because its You + 3 friends.
well done Hi, you got it wrong
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.