OpenStudy (lovelyanna):

Brad has 7 autographed baseballs. His display case only holds 5 baseballs. How many different displays can Brad make? A. 21 B. 2520 C. 5040 D. 840

3 years ago
OpenStudy (anonymous):

I think it A 21 7c3

3 years ago
OpenStudy (anonymous):

sorry 7c5

3 years ago
OpenStudy (math&ing001):

Does the order matter ?

3 years ago
OpenStudy (lovelyanna):

I don't get how he got 21, and I'm not sure...

3 years ago
OpenStudy (lovelyanna):

Not sure about the order

3 years ago
OpenStudy (anonymous):

|dw:1395426853966:dw| and solve it in combinations

3 years ago
OpenStudy (math&ing001):

If the order in which they are displayed matters then we count the number of arrangements : 5A7 = 2520 If f the order in which they are displayed doesn't matters then we count the number of combinations: 5C7=21

3 years ago
OpenStudy (lovelyanna):

Hmm... I see. I'll do the first one were the display matters. Thanks! Can you help me with 1 more?

3 years ago
OpenStudy (lovelyanna):

How many ways can an employer send 3 employees to a job fair if she has 11 employees? A. 40,320 B. 990 C. 6,652,800 D. 165 Is it D?

3 years ago
OpenStudy (lovelyanna):

@jigglypuff314

3 years ago
OpenStudy (lovelyanna):

I'm gonna reload, my computer is glitching

3 years ago
OpenStudy (lovelyanna):

So, if the display doesn't matter in the second on, it's B? :/

3 years ago
OpenStudy (math&ing001):

You use the number of combinations \[C _{11}^{3}=165\] Your answer is correct !

3 years ago
OpenStudy (lovelyanna):

one*

3 years ago
OpenStudy (lovelyanna):

Hooray :D Thanks

3 years ago
OpenStudy (math&ing001):

And for the first if the display doesn't matter it's A :))

3 years ago
OpenStudy (lovelyanna):

Okie dokie :) Thanks!

3 years ago
OpenStudy (math&ing001):

Anytime !

3 years ago
OpenStudy (lovelyanna):

Thanks for the medal ^.^ ♥

3 years ago
OpenStudy (anonymous):

For the Brad question...order matters because you only have 7 baseballs and 5 display cases. This is a permutation and the answer is C. 2520

2 years ago