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Gmat Prep?? (Prob)

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by dferm » Thu Aug 28, 2008 8:38 pm
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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by saeed » Thu Aug 28, 2008 9:08 pm
I guess the answer is B.
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Re: Gmat Prep?? (Prob)

by parallel_chase » Thu Aug 28, 2008 9:09 pm
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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by rishi235 » Thu Aug 28, 2008 9:10 pm
IMO B....3/10
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Re: Gmat Prep?? (Prob)

by sudhir3127 » Thu Aug 28, 2008 9:13 pm
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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