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a rectangular floor measures 2 by 3 meters. there are 5

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CEO
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a rectangular floor measures 2 by 3 meters. there are 5 [#permalink] New post 05 Nov 2007, 08:49
a rectangular floor measures 2 by 3 meters.
there are 5 white, 5 black and 5 yellow parquet blocks available.
Each block measures 1*1 meter.
In how many different color patterns can the floor be parqueted?
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 [#permalink] New post 05 Nov 2007, 13:36
ok, the area of the floor is 2*3=6 and the area of each block is 1*1=6
so there must be 6 blocks total.
As for the color combination; there are 3 different colors
For the first block, there will be 3 choice
2nd block, three color choice
3rd, 4th, and 5th all have 3 color choice
the 6th one will end up with 2 color choice because each color has only 5 pieces.
So it will be 3*3*3*3*3*2=486 different color patterns.
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 [#permalink] New post 09 Nov 2007, 19:29
How would you solve this with Permutation/Combination?

Thanks
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Re: Area [#permalink] New post 10 Nov 2007, 00:04
bmwhype2 wrote:
a rectangular floor measures 2 by 3 meters.
there are 5 white, 5 black and 5 yellow parquet blocks available.
Each block measures 1*1 meter.
In how many different color patterns can the floor be parqueted?


Can someone please tell me why we cannot approach this problem as follows:
We have a total of 15 tiles. We need 6 to fill the floor. The way we can choose 6 tiles out of 15 is 15C6 = 5005.

What is wrong with this logic? I'm assuming that this approach does not account for color combinations? If so, how can we tweak this approach to solve the problem?

I'm pathetic w/ perms & combs so thanks for your help.
Re: Area   [#permalink] 10 Nov 2007, 00:04
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a rectangular floor measures 2 by 3 meters. there are 5

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