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Combinatory Ch 4 #15

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lisyuan
 Post subject: Combinatory Ch 4 #15
 Post Posted: Mon Sep 08, 2008 12:56 am 
I am having problem to understand the problem #15.

On the first step, it excludes the oprtion of not wanting the G.I doll. The calculation was 5!/2!, is this a simplified fomor of

5!/ 2!1!1!1!? Because we have 2 repeated doll, and one for each other 3 types of dolls.

Same for the second step, 4!/2! is a simplified form of 4!/2!1!1!?
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StudyStrong
 Post subject:
 Post Posted: Tue Oct 07, 2008 5:35 pm 
Could you write out the problem?

Thanks
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JonathanSchneider
 Post subject:
 Post Posted: Wed Nov 19, 2008 9:05 pm 
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ManhattanGMAT Staff


Posts: 380
Yes, it is simplified from 5!/2!1!1!1! We don't write out the 1! each time, because it has no effect.
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