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March 20th, 2016, 11:56 AM   #1
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Combinatorics : counting

Hi,

We have a grid 6x6.
We want to place on each square one of 36 tokens.

18 tokens are red : 6 copies of tokens numbered from 1 to 3.

18 tokens are blue : 6 copies of tokens numbered from 1 to 3.

In how many different ways could we place them all?

Thank you.

Ps : It is not a homework.
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March 24th, 2016, 05:20 AM   #2
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36!/((3!)^6)

Am I wrong?
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