- #1

- 18

- 0

I know the answer is 8008 but I have no idea how to get this

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- Thread starter EvilPony
- Start date

- #1

- 18

- 0

I know the answer is 8008 but I have no idea how to get this

- #2

- 281

- 1

- #3

- 18

- 0

im pretty sure you have to use all 25 every time

- #4

- 281

- 1

They must mean arrangements of all possible sizes, since the total number of arrangements of size 25 is much much less than 8008. My method involves breaking the situation into cases based on how big the arrangement is. I will provide more tomorrow. Good luck

-MS

- #5

- 276

- 0

The pink balls can not be touching each other so you need if you have 10 pink you need 9 purple.

Now you have 6 purple balls left to distribute and 11 places to put it.

This model is used in the Einstein solid to model the multiplicity of a solid with r atoms and N units of energy to distribute.

[tex]

\Omega = \binom{N+r-1}{r-1}

[/tex]

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