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Permutations and Combinations Question  Unlimited balls of 4 varieties  
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#19
Mar1410, 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. 


#20
Mar1410, 01:10 PM

P: 501

Many thanks for the response and for clearing up that confusion. 


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