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Probability

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rencsee
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Joined: 13 May 2017
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Location: Finland
Concentration: Accounting, Entrepreneurship
GMAT 1: 600 Q42 V28
GMAT 2: 530 Q42 V22
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GPA: 3.14
WE:Account Management (Entertainment and Sports)
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Probability [#permalink] New post  13 May 2017, 13:48
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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Skywalker18
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Re: Probability [#permalink] New post  13 May 2017, 21:56
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rencsee wrote:
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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rencsee
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Joined: 13 May 2017
Posts: 47
Location: Finland
Concentration: Accounting, Entrepreneurship
GMAT 1: 600 Q42 V28
GMAT 2: 530 Q42 V22
GMAT 3: 570 Q36 V31
GPA: 3.14
WE:Account Management (Entertainment and Sports)
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Re: Probability [#permalink] New post  13 May 2017, 13:49


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rencsee
Intern
Intern
Joined: 13 May 2017
Posts: 47
Location: Finland
Concentration: Accounting, Entrepreneurship
GMAT 1: 600 Q42 V28
GMAT 2: 530 Q42 V22
GMAT 3: 570 Q36 V31
GPA: 3.14
WE:Account Management (Entertainment and Sports)
Reviews Badge
Re: Probability [#permalink] New post  14 May 2017, 01:44
Skywalker18 wrote:
rencsee wrote:
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

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.

Sent from my SM-G920F using GMAT Club Forum mobile app
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ccooley
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Joined: 04 Dec 2015
Posts: 935
GMAT 1: 790 Q51 V49
GRE 1: Q170 V170
Re: Probability [#permalink] New post  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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Re: Probability [#permalink] New post  29 Jan 2019, 15:17
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Re: Probability [#permalink]
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