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PS-A Large Cube-Probability

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PS-A Large Cube-Probability [#permalink] New post 31 Mar 2009, 23:33
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A large cube 10cm on a side is composed of smaller cubes 1 cm on a side. The large cube is printed red on its outside surfaces and then all the cubes are mixed in a drum. If one cube is selected randomly, which of the following is the approximate probability that the cube will have at least one red face?
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Re: PS-A Large Cube-Probability [#permalink] New post 31 Mar 2009, 23:46
Number of 1cm3 cubes = 10*10*10 = 1000
Number of 1cm3 cubes that are not painted = 8*8*8 = 512
Probability = (1000 - 512) / 1000 ~ 1/2
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Re: PS-A Large Cube-Probability [#permalink] New post 31 Mar 2009, 23:54
nitya34 wrote:
A large cube 10cm on a side is composed of smaller cubes 1 cm on a side. The large cube is printed red on its outside surfaces and then all the cubes are mixed in a drum. If one cube is selected randomly, which of the following is the approximate probability that the cube will have at least one red face?


total number of cubes = 1000
Not painted = 8^3 = 512

At least problem :) => 1 - 512/1000 = 488/1000
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Re: PS-A Large Cube-Probability [#permalink] New post 01 Apr 2009, 01:30
thanks :)
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Re: PS-A Large Cube-Probability   [#permalink] 01 Apr 2009, 01:30
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