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dferm
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 Posted: Thu Aug 28, 2008 8:38 pm Post subject: Gmat Prep?? (Prob) |
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A certain manufacturer of cake, muffin, and bread mixes has 100 buyers, of whom 50 purchase cake mix, 40 purchase muffin mix, and 20 purchase both cake mix and muffin mix. If a buyer is to be selected at random from 100 buyers, what is the probability that the buyer selected will be one who purchases neither cake mix nor muffin mix?
A.1/10
B.3/10
C.1/2
D.7/10
E.9/10
Please Help... |
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saeed
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| Posted: Thu Aug 28, 2008 9:08 pm Post subject: |
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| I guess the answer is B. |
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parallel_chase
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| Posted: Thu Aug 28, 2008 9:09 pm Post subject: Re: Gmat Prep?? (Prob) |
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| dferm wrote: | A certain manufacturer of cake, muffin, and bread mixes has 100 buyers, of whom 50 purchase cake mix, 40 purchase muffin mix, and 20 purchase both cake mix and muffin mix. If a buyer is to be selected at random from 100 buyers, what is the probability that the buyer selected will be one who purchases neither cake mix nor muffin mix?
A.1/10
B.3/10
C.1/2
D.7/10
E.9/10
Please Help... |
100=50+40-20+x
100-70 = x
30=x
probability = 30/100=3/10 |
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rishi235
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| Posted: Thu Aug 28, 2008 9:10 pm Post subject: |
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| IMO B....3/10 |
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sudhir3127
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| Posted: Thu Aug 28, 2008 9:13 pm Post subject: Re: Gmat Prep?? (Prob) |
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| dferm wrote: | A certain manufacturer of cake, muffin, and bread mixes has 100 buyers, of whom 50 purchase cake mix, 40 purchase muffin mix, and 20 purchase both cake mix and muffin mix. If a buyer is to be selected at random from 100 buyers, what is the probability that the buyer selected will be one who purchases neither cake mix nor muffin mix?
A.1/10
B.3/10
C.1/2
D.7/10
E.9/10
Please Help... |
i am with 1/3
Probability of not Cake mix not muffin is
(1-50/100)*( 1- 40/100)
1/2* 6/10= 3/10
Hope that helps.. |
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