Question

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

Answer 1

I think it A
21
7c3

Answer 2

sorry
7c5

Answer 3

Does the order matter ?

Answer 4

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

Answer 5

Not sure about the order

Answer 6

and solve it in combinations

Answer 7

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

Answer 8

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

Answer 9

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?

Answer 10

@jigglypuff314

Answer 11

I'm gonna reload, my computer is glitching

Answer 12

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

Answer 13

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

Answer 14

one*

Answer 15

Hooray :D Thanks

Answer 16

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

Answer 17

Okie dokie :) Thanks!

Answer 18

Anytime !

Answer 19

Thanks for the medal ^.^ ♥

Answer 20

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