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In how many ways can a soccer team finish the season with 3

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In how many ways can a soccer team finish the season with 3 [#permalink] New post 07 Feb 2008, 11:28
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In how many ways can a soccer team finish the season with 3 wins, 2 losses and 1 draw?

6

20

60

120

240
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Re: repetition [#permalink] New post 07 Feb 2008, 12:25
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C

P=\frac{P^6_6}{P^3_3*P^2_2}=\frac{6*5*4*3*2}{3*2*2}=60
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Re: repetition [#permalink] New post 07 Feb 2008, 14:43
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6C3 = 20
3C2 = 3
1C1 = 1

20*3*1 = 60
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Re: repetition [#permalink] New post 07 Feb 2008, 15:26
agree with the above.

(6C3)*(3C2)*(1C1) = 60

First term gives us number of ways for team to win 3 of its total of 6 games. Second term tells us how many ways there are for the team to lose 2 of its remaining 3 games. Last term is of course 1C1, as there is only one game left.
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Re: repetition [#permalink] New post 08 Feb 2008, 17:30
Isn't order important in this case?

-Jack
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Re: repetition [#permalink] New post 08 Feb 2008, 19:14
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no. of ways = 6!/3!2! = 60
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Re: repetition [#permalink] New post 09 Feb 2008, 00:51
vshaunak@gmail.com wrote:
no. of ways = 6!/3!2! = 60

why do we permute across 6 slots and account for the repeats? i dont understand the logic of it.
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Re: repetition [#permalink] New post 09 Feb 2008, 04:04
bmwhype2 wrote:
vshaunak@gmail.com wrote:
no. of ways = 6!/3!2! = 60

why do we permute across 6 slots and account for the repeats? i dont understand the logic of it.


Thanks for making me rethink ....I thought on different lines...this is not the way this ques should be solved.

I think the correct approach is:
6C3 *3C2 *1C1 = 60
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Re: repetition [#permalink] New post 09 Feb 2008, 04:32
Expert's post
vshaunak@gmail.com wrote:
bmwhype2 wrote:
vshaunak@gmail.com wrote:
no. of ways = 6!/3!2! = 60

why do we permute across 6 slots and account for the repeats? i dont understand the logic of it.


Thanks for making me rethink ....I thought on different lines...this is not the way this ques should be solved.

I think the correct approach is:
6C3 *3C2 *1C1 = 60


I think no. of ways = 6!/3!2! = 60 is correct.

6!=6P6 - all possible permutation with 3 wins, 2 losses and 1 draw
3!=3P3 - we exclude options for wins: (w1,w2,w3,l,l,d) and (w3,w1,w2,l,l,d) are the same way.
2!=2P2 - we exclude options for losses: (w,w,w,l1,l2,d) and (w,w,w,l2,l1,d) are the same way.
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Re: repetition [#permalink] New post 09 Feb 2008, 08:42
Walker,

To eliminate repetitions...shouldn't you be subtracting them from 6!......if at all you choose to do it that way.
Why would you divide...can you explain?

Also, doing permutation and then eliminating repetitions isn't effectively a combination.
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Re: repetition [#permalink] New post 09 Feb 2008, 12:23
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kyatin wrote:
Walker,

To eliminate repetitions...shouldn't you be subtracting them from 6!......if at all you choose to do it that way.
Why would you divide...can you explain?


We have two independent options. For example, three-digits integer:
total number of options is 999-100+1=900
the number of options for the first (units) digit: 10
the number of options for the second and third digits: 900/10=90 (division)

Moreover, nCm=nPm/mPm - the same situation with elimination of repetitions :)

kyatin wrote:
Also, doing permutation and then eliminating repetitions isn't effectively a combination.

For me it is an effective under-1-min way. In the case of permutation-combination problems I prefer to have a few methods
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Re: repetition [#permalink] New post 10 Feb 2008, 21:42
walker wrote:
C

P=\frac{P^6_6}{P^3_3*P^2_2}=\frac{6*5*4*3*2}{3*2*2}=60


in case of repeated elements ([b]we have 3 wins and 2 losses)[/b] we must divide the total number! by the repeated elements!. in this case 6!/3!*2!. this is a formula
Re: repetition   [#permalink] 10 Feb 2008, 21:42
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