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In how many ways 5 different balls can be arranged in to 3

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In how many ways 5 different balls can be arranged in to 3 [#permalink] New post 07 Aug 2010, 05:10
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In how many ways 5 different balls can be arranged in to 3 different boxes so that no box remains empty?
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Re: how to solve these ps question [#permalink] New post 08 Aug 2010, 04:27
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aaratigarlapati wrote:
In how many ways 5 different balls can be arranged in to 3 different boxes so that no box remains empty?

help me please...


Boxes: I - II - III
Balls: a, b, c, d, e.

There are only 2 distributions possible 3-1-1 or 1-2-2.

3-1-1 case: C^1_3*C^3_5*2=60.
C^1_3 - # of ways to choose which box will get 3 balls;
C^3_5 - # of ways to choose which 3 balls will get this chosen box;
2 - # of ways to place 2 balls left in 2 other boxes.

1-2-2 case: C^1_3*C^1_5*C^2_4=90.
C^1_3 - # of ways to choose which box will get 1 ball;
C^1_5 - # of ways to choose which ball will get this chosen box;
C^2_4 - # of ways to choose which 2 balls will get the second box (the third box will get the left 2 balls).

Total: 60+90=150.
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Re: how to solve these ps question [#permalink] New post 08 Aug 2010, 05:45
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another way:

1. The total number of possibilities including empty boxes: 3^5 = 243

2. Two of the boxes are empty: C^3_2= 3

3. One but not two of the boxes is empty: 3*(2^5 - 2) = 90

4. the total number of possibilities excluding empty boxes: 243 - 3 - 90 = 150
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Re: how to solve these ps question [#permalink] New post 24 Dec 2012, 09:50
walker wrote:
another way:
3. One but not two of the boxes is empty: 3*(2^5 - 2) = 90


Can you explain this part..... thanks
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Re: how to solve these ps question [#permalink] New post 25 Dec 2012, 06:37
Amateur wrote:
walker wrote:
another way:
3. One but not two of the boxes is empty: 3*(2^5 - 2) = 90


Can you explain this part..... thanks



Assume one box is empty. Now take the other 2 boxes out of 3 boxes. The number of ways of placing the 5 balls in 2 boxes is 2 ^ 5 . But this includes the combinations where 5 balls placed in one of them and the other is empty. The number of such combinations is 2 as we are considering 2 boxes. So subtract that from 2^ 5 as we are considering only one empty box, which we assumed at the beginning. That gives us2^5 - 2. Now we have actually 3 boxes. So any 2 boxes as above can be selected out of the 3 boxes in 3 ways. Therefore the we have3 * (2^5 - 2)

The above gives the number of combinations where only 1 box is empty. This has to be added to the number of possibilities of two boxes being empty which is 3. The total is 93. This has to be subtracted from the total number of possibilities of 3 ^ 5
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Re: In how many ways 5 different balls can be arranged in to 3 [#permalink] New post 25 Dec 2012, 07:12
thank you Srinivasan
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Re: In how many ways 5 different balls can be arranged in to 3 [#permalink] New post 27 Dec 2012, 22:37
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aaratigarlapati wrote:
In how many ways 5 different balls can be arranged in to 3 different boxes so that no box remains empty?


How can we feel three boxes with 5 balls?
3 + 1 + 1
2 + 2 + 1

With 3,1,1 distribution:
How many ways to select 3 from 5?
5!/3!2! = 10
How many ways to select 1 ball from 2?
2!/1! = 2
How many ways to select 1 ball from 1?
1!/1! = 1
How many ways to distribute 3,1 and 1 to 3 boxes? 3!/2! = 3

10*2*3 = 60

With 2,2,1 distribution:
How many ways to select 2 from 5?
5!/2!3! = 10
How many ways to select 2 from 3?
3!/2!1! = 3
How many ways to select 1 from 1?
1
How many ways to distribute 2,2,1 to 3 boxes? 3!/2! = 3

10*3*3=90

90+60 = 150

Answer: 150
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Re: In how many ways 5 different balls can be arranged in to 3   [#permalink] 27 Dec 2012, 22:37
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