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rencsee
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Probability 13 May 2017, 13:48
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Can someone help out here please? I'm not managing getting the right answer.

I'm quite lost at probability, combinatorics questions. For now finished Manhattan prep Math parts and about to continue with the verbal. But I feel I need something extra for this topic. May I ask your recommendation how to make prob/combinatorics a stronger skill?

Thanks in advance.

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Probability 13 May 2017, 13:49
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Probability 13 May 2017, 21:56
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rencsee
Can someone help out here please? I'm not managing getting the right answer.

I'm quite lost at probability, combinatorics questions. For now finished Manhattan prep Math parts and about to continue with the verbal. But I feel I need something extra for this topic. May I ask your recommendation how to make prob/combinatorics a stronger skill?

Thanks in advance.

Sent from my SM-G920F using GMAT Club Forum mobile app
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Hi rencsee ,
Once you are clear with basics of counting and combinatorics, you can attempt the GMAT Club tests.
Probability of getting on the base, P(b) = 1/4
Probability of not getting to the base, P(b') = 1- 1/4 = 3/4

Number of times the player comes to bat = 5
Probability that player gets on base 3 or 4 times
=5C3 * \((1/4)^3\) * \((3/4)^2\)+ 5C4 * \((1/4)^4\) * (3/4)
= (10 * 3* 3 + 5* 3 ) /1024
=(90+15)/1024
=105/1024
=.10
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Probability 14 May 2017, 01:44
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Skywalker18
rencsee
Can someone help out here please? I'm not managing getting the right answer.

I'm quite lost at probability, combinatorics questions. For now finished Manhattan prep Math parts and about to continue with the verbal. But I feel I need something extra for this topic. May I ask your recommendation how to make prob/combinatorics a stronger skill?

Thanks in advance.

Sent from my SM-G920F using GMAT Club Forum mobile app

Hi rencsee ,
Once you are clear with basics of counting and combinatorics, you can attempt the GMAT Club tests.
Probability of getting on the base, P(b) = 1/4
Probability of not getting to the base, P(b') = 1- 1/4 = 3/4

Number of times the player comes to bat = 5
Probability that player gets on base 3 or 4 times
=5C3 * \((1/4)^3\) * \((3/4)^2\)+ 5C4 * \((1/4)^4\) * (3/4)
= (10 * 3* 3 + 5* 3 ) /1024
=(90+15)/1024
=105/1024
=.10
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Hi Skywalker18,
Thanks for your reply. I got it. Actually I was using the same method but miscalculated. Maybe it was to late for my brain. I will check Gmat Club Test.

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Probability 17 May 2017, 14:11
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Here's something I recently wrote about learning to handle combinatorics. (There are three articles in the series, so click on all of the links). It's not an exhaustive introduction, but it should get you going in the right direction.

https://www.manhattanprep.com/gmat/blog ... cs-part-1/
https://www.manhattanprep.com/gmat/blog ... cs-part-2/
https://www.manhattanprep.com/gmat/blog ... cs-part-3/
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Probability 29 Jan 2019, 15:17
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Automated notice from GMAT Club BumpBot:

A member just gave Kudos to this thread, showing it’s still useful. I’ve bumped it to the top so more people can benefit. Feel free to add your own questions or solutions.

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Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
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Thank you for understanding, and happy exploring!