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gmat prep question

by yvonne12 » Sun Apr 15, 2007 5:54 pm
A certain office supply store stocks 2 sizes of self stick notepads, each in 4 colors: blue, green, yellow and pink. the store packs the notepads in packages that contain either 3 notepads of the same size and the same color or 3 notepads of the same size and of 3 different colors. I fthe order, in which the colors are packed is not consumed, how many different packages of the types described above are possible?
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Re: gmat prep question

by jayhawk2001 » Sun Apr 15, 2007 8:51 pm
yvonne12 wrote:A certain office supply store stocks 2 sizes of self stick notepads, each in 4 colors: blue, green, yellow and pink. the store packs the notepads in packages that contain either 3 notepads of the same size and the same color or 3 notepads of the same size and of 3 different colors. I fthe order, in which the colors are packed is not consumed, how many different packages of the types described above are possible?
We have to compute the numbers over 2 cases --

1 - Same size, same color

2C1 * 4C1 = 8

2 - Same size, 3 unique colors

2C1 * 4C3 = 8

Hence total = 16
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by Cybermusings » Mon Apr 16, 2007 2:31 am
Whats the OA?
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yes

by yvonne12 » Mon Apr 16, 2007 4:27 pm
yes 16 is the answer,

jayhawk, can you tell me where I can go to extend my knowledge on combinatrics, its seems to be a weakness of mine.
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Re: yes

by jayhawk2001 » Mon Apr 16, 2007 7:19 pm
yvonne12 wrote:yes 16 is the answer,

jayhawk, can you tell me where I can go to extend my knowledge on combinatrics, its seems to be a weakness of mine.
I found quite a bit of resources on Beat the GMAT Math wiki that
was exclusively probability and combination. That might be a good
start. After that, practice practice practice and you'll see some common
themes.

I wish I could suggest a book but unfortunately I haven't seen one
that deals exclusively with GMAT type probability questions.
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