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.
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