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xjoohn -
post Jun 1 2007, 06:25 PM
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10. A purse contains 5 different coins (penny, nickel, dime, quarter, half-dollar). How many different sums of money can be made using one or more coins?
A. 5
B. 10
C. 32
D. 120
E. none of the above

It will be really nice of you to explain me how to do this problem. cray.gif

This post has been edited by xjoohn: Jun 1 2007, 06:26 PM


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ViCtim -
post Jun 1 2007, 06:28 PM
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it would be way higher than 120.. so none of the above


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Siege -
post Jun 1 2007, 06:37 PM
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Well....

Theres five ways to choose 1 coin.
Theres 10 ways to choose 2 coins.
Theres 10 ways to choose 3 coins.
Theres 5 ways to choose 4 coins
Theres 1 way to choose five coins.

5+10+10+5+1 = 31?


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pwS -
post Jun 1 2007, 06:41 PM
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we have a homework help section...


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blade85 -
post Jun 1 2007, 07:19 PM
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Permutations and Combinations lol
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xjoohn -
post Jun 1 2007, 07:25 PM
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QUOTE (Siege @ Jun 1 2007, 06:37 PM)
Well....

Theres five ways to choose 1 coin.
Theres 10 ways to choose 2 coins.
Theres 10 ways to choose 3 coins.
Theres 5 ways to choose 4 coins
Theres 1 way to choose five coins.

5+10+10+5+1  = 31?

Thanks, that seems right. in fact, it is right when i look at the answer key. the answer key i have also contains explanations but the reason i posted up here was because i didn't understand the explanation that they gave. they sort of gave me this formula that looks like this -> 2^5-1=31.

Can you explain how that formula works as well??? thanks

PS: I psoted in this section because I need to know this asap.

This post has been edited by xjoohn: Jun 1 2007, 07:26 PM


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Siege -
post Jun 1 2007, 09:46 PM
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Well, the way I did it is the way I know how to do it... Using Permutations and Combinations which we just took a test on today....

If you have a graphing calculator theres a button under Math --> Prb --> Then either nCr or nPr depending on what you want to do. Its a combination or a permutation depending on what your doing.


What math are you in?

I'll be on my computer all day tomo if you want any more help or anything since I'm at work all day and I just sit there reading a book for half of it.


This post has been edited by Siege: Jun 1 2007, 09:52 PM


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RoundBear -
post Jun 1 2007, 10:00 PM
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I think it's 5x4x3x2x1=120. I may be wrong though. Playing right now and did the section months ago.


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foxshox -
post Jun 1 2007, 10:04 PM
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QUOTE (RoundBear @ Jun 1 2007, 10:00 PM)
I think it's 5x4x3x2x1=120. I may be wrong though. Playing right now and did the section months ago.

Its not asking for the number of different possible 5 coin combinations.
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