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Permutations and Combinations Question | Unlimited balls of 4 varieties |

by dharavsolanki
Tags: balls, combinations, number of ways, permutations
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Landau
#19
Mar14-10, 11:43 AM
Sci Advisor
P: 905
Short pointer: order doesn't matter.
Longer pointer: blue, blue, green, red, ..., red is to be considered the same as blue, green, blue, red, ..., red. In mathematical language, we're considering multisets.

You can pick the 9 balls as follows: a blue ones, b green ones, c red ones, d white ones.
The question is, how many different pairs (a,b,c,d) are there such that a+b+c+d=9.
nobahar
#20
Mar14-10, 01:10 PM
P: 501
Quote Quote by Landau View Post
Short pointer:... Longer pointer:...
That made me laugh.
Many thanks for the response and for clearing up that confusion.


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