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Re: If Jessica rolls a die, what is the probability of getting
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17 Jun 2015, 04:45
2
yamshi06 wrote:
i approached like this , not getting a 3=5/6
atleast=1-5\6 = 1/6
pls explain what is wrong in the approach??
Probability = Favorable Outcomes / Total Outcomes
A Die has 6 faces numbered from 1 through 6
i.e. Total Out comes = 6
Favorable outcomes = Numbers atleast 3 = numbers greater than or equal to 3 i.e. {3, 4, 5, 6} = 4
i.e. Probability = 4/6 = 2/3
ALTERNATIVELY
Probability = 1 -(Unfavorable Outcomes / Total Outcomes
Unfavorable outcomes = Numbers less than 3 = i.e. {1, 2} = 2
i.e. Probability = 1 -(2/6) = 1-(1/3) = 2/3
I hope it clears your doubt! _________________
Prosper!!! GMATinsight Bhoopendra Singh and Dr.Sushma Jha e-mail: info@GMATinsight.com I Call us : +91-9999687183 / 9891333772 Online One-on-One Skype based classes and Classroom Coaching in South and West Delhi http://www.GMATinsight.com/testimonials.html
Re: If Jessica rolls a die, what is the probability of getting
[#permalink]
Show Tags
17 Jun 2015, 04:47
yamshi06 wrote:
i approached like this , not getting a 3=5/6
atleast=1-5\6 = 1/6
pls explain what is wrong in the approach??
Please Note "If you subtract the probability of NOT getting 3 from 1 then you will get Probability of getting 3"
whereas the question demand the probability of getting ATLEAST3
_________________
Prosper!!! GMATinsight Bhoopendra Singh and Dr.Sushma Jha e-mail: info@GMATinsight.com I Call us : +91-9999687183 / 9891333772 Online One-on-One Skype based classes and Classroom Coaching in South and West Delhi http://www.GMATinsight.com/testimonials.html
Re: If Jessica rolls a die, what is the probability of getting
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17 Jun 2015, 05:32
yamshi06 wrote:
we mainly do like dis, P(at least one success) = 1 – P(no success)
i missing something in this concept plsd explain??
You are getting it Right in this context Yashmi
P(at least one success) = 1 – P(no success) is CORRECT
But Probability of buying atleast 2 apples will NOT be same as (1-probability of buying NO apple)
You must Understand that Probability of buying atleast 2 apples will be equal to (1-probability of NOT buying 2 or more apple) _________________
Prosper!!! GMATinsight Bhoopendra Singh and Dr.Sushma Jha e-mail: info@GMATinsight.com I Call us : +91-9999687183 / 9891333772 Online One-on-One Skype based classes and Classroom Coaching in South and West Delhi http://www.GMATinsight.com/testimonials.html
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80% (00:10) correct 
