Strategy for Probability

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moron: Junior | Next Rank: 30 Posts; Posts: 15; Joined: Tue Oct 06, 2015 9:04 pm; Thanked: 1 times

Strategy for Probability

by moron » Tue Nov 10, 2015 6:39 pm

Can anyone suggest when it is better to use Combination nCr vs when it is better to use counting method ? Examples will be be appreciated.
I finally get the answer but it consumes lot of time. This happens for bit difficult questions.
Thanks

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Brent@GMATPrepNow: GMAT Instructor; Posts: 16207; Joined: Mon Dec 08, 2008 6:26 pm; Location: Vancouver, BC; Thanked: 5254 times; Followed by:1268 members; GMAT Score:770

by Brent@GMATPrepNow » Tue Nov 10, 2015 9:06 pm

We have a free video that answers that question - https://www.gmatprepnow.com/module/gmat- ... /video/788

Cheers,
Brent

Brent Hanneson - Creator of GMATPrepNow.com

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[email protected]: Elite Legendary Member; Posts: 10392; Joined: Sun Jun 23, 2013 6:38 pm; Location: Palo Alto, CA; Thanked: 2867 times; Followed by:511 members; GMAT Score:800

by [email protected] » Wed Nov 11, 2015 9:50 am

Hi m,

If you've come across specific prompts that have taken you a long time to solve (or have given you any type of trouble), then you should post them here. You would probably find it beneficial to watch the Experts and other Users work through those questions.

GMAT assassins aren't born, they're made,
Rich

Contact Rich at [email protected]

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Jim@StratusPrep: MBA Admissions Consultant; Posts: 2279; Joined: Fri Nov 11, 2011 7:51 am; Location: New York; Thanked: 660 times; Followed by:266 members; GMAT Score:770

by Jim@StratusPrep » Wed Nov 11, 2015 11:56 am

You will likely find this helpful: https://gmatanswers.com/posts/gmat-permu ... mbinations

This is not the traditional way these subjects are taught.

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