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13 May 2017, 13:48
Kudos
Bookmarks
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
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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13 May 2017, 13:49
Kudos
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13 May 2017, 21:56
Kudos
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rencsee
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
