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# Probability

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Manager
Joined: 04 Apr 2013
Posts: 150

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29 Apr 2014, 06:25
Formulas for

5 distinct things in 4 distinct groups

5c4/2!

5 identical things in 4 distinct groups
n+r-1 c r-1

5 distinct things in 4 identical groups
-- Dont know.

5 identical things in 4 identical groups
4^5

Are these correct.

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MGMAT1 - 540 ( Trying to improve )

Magoosh GMAT Instructor
Joined: 28 Dec 2011
Posts: 4128

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30 Apr 2014, 16:47
Formulas for

5 distinct things in 4 distinct groups

5c4/2!

5 identical things in 4 distinct groups
n+r-1 c r-1

5 distinct things in 4 identical groups
-- Dont know.

5 identical things in 4 identical groups
4^5

Are these correct.

I'm happy to respond. With all due respect, you have not done a very good job of asking your question. Use complete sentences. Be very clear about exactly what you mean. For example, in the phrase "5 distinct things in 4 distinct groups," I have no clue what you are trying to communicate. You need to explain a specific example in detail.

Part of being an excellent student is learning how to ask high quality questions. If you can ask truly high quality questions, then you will get all the information that you need. This is a very difficult skill to learn, and students often underestimate how much it can help them.

Mike
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Mike McGarry
Magoosh Test Prep

Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 7440
Location: Pune, India

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01 May 2014, 20:58
Formulas for

5 distinct things in 4 distinct groups

5c4/2!

5 identical things in 4 distinct groups
n+r-1 c r-1

5 distinct things in 4 identical groups
-- Dont know.

5 identical things in 4 identical groups
4^5

Are these correct.

No, they are not. I have discussed these 4 cases in the following two posts:
http://www.veritasprep.com/blog/2011/12 ... 93-part-1/
http://www.veritasprep.com/blog/2011/12 ... s-part-ii/
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Karishma
Veritas Prep | GMAT Instructor
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Re: Probability   [#permalink] 01 May 2014, 20:58
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