combinometrics

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amyhussein: Junior | Next Rank: 30 Posts; Posts: 26; Joined: Wed Apr 21, 2010 12:52 pm

by amyhussein » Wed Mar 13, 2013 11:31 am

there are 2 sizes of books provided by a book store. each size has only 4 colours (blue, green, yellow and purple). there are 2 ways to compile the books either by choosing 3 of the same size and colour or by 3 of the same size and different colours. how many possibilities to choose books?

how come the anser is 16?

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Source: Beat The GMAT — Problem Solving | Wed Mar 13, 2013 11:31 am

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Anju@Gurome: GMAT Instructor; Posts: 511; Joined: Wed Aug 11, 2010 9:47 amFollowed by: 86 members; Location: Delhi, India; Thanked: 344 times

by Anju@Gurome » Wed Mar 13, 2013 11:39 am

I'm assuming the original question is as follows...

A certain office supply store stocks 2 sizes of self-stick notepads, each in 4 colors: Blue, Green, Yellow Or 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. If the order in which the colors are packed is not considered, how many different packages of the types described above are possible?

Please refer to the post here>> https://www.beatthegmat.com/gmat-prep-ps ... tml#465373

Anju Agarwal
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amyhussein: Junior | Next Rank: 30 Posts; Posts: 26; Joined: Wed Apr 21, 2010 12:52 pm

by amyhussein » Wed Mar 13, 2013 11:46 am

hello
may you please tell me how you search topics so i check before posting?

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