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Probability & Premutation-Combination

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by Mike@Magoosh » Wed May 16, 2012 3:06 pm
Hi, there. I'm happy to help with this. :)

Here's a blogpost I wrote about that you may find germane.
https://magoosh.com/gmat/2012/gmat-permu ... binations/

If order matters --- if ACBD will count in this context as something inherently different from BCDA, then you are dealing with permutations.

If order doesn't matter ---- if ACBD and BCDA are, for all intents and purposes, identical in this context, then you are dealing with combinations.

Do you have a specific question in mind in which you have trouble telling whether order matters? I happy to show a full solution to any GMAT question you have.

Mike :)
Magoosh GMAT Instructor
https://gmat.magoosh.com/
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