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# Henry just landed three dates with a really hot girl (I know

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Director
Joined: 14 Oct 2003
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Henry just landed three dates with a really hot girl (I know [#permalink]  30 Dec 2003, 17:17
Henry just landed three dates with a really hot girl (I know it usually doesn't work that way in the real world but this is GMAT world!). The probability that he will get her to (I know what you're thinking but no!)...see his apartment on date # 1 is 50%. The probability that she'll see his apartment on day 2 is 50%. The probability she'll come over on day 3 is also 50%. What is the probability that she'll visit Henry's apartment on at least one of the dates?

a) 1/2

b) 1/4

c) 2/7

d) 3/7

e) 7/8

Last edited by Titleist on 30 Dec 2003, 18:14, edited 1 time in total.
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Please explain me what I'm doing wrong. I came up with answer 7/8. Isn't the formula: total possible outcome - probability that she does not visit appartment on all 3 dates? The probability that she does not come on 3 dates: 1/8. I then did 1 - 1/8 = 7/8
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Paul

Director
Joined: 14 Oct 2003
Posts: 588
Location: On Vacation at My Crawford, Texas Ranch
Followers: 1

Kudos [?]: 10 [0], given: 0

Sorry that was a typo 3/8 should be 7/8. I'll make the fix.

Thanks Paul!
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Re: Probability of Getting a Girl to... [#permalink]  30 Dec 2003, 19:46
Titleist wrote:
Henry just landed three dates with a really hot girl (I know it usually doesn't work that way in the real world but this is GMAT world!). The probability that he will get her to (I know what you're thinking but no!)...see his apartment on date # 1 is 50%. The probability that she'll see his apartment on day 2 is 50%. The probability she'll come over on day 3 is also 50%. What is the probability that she'll visit Henry's apartment on at least one of the dates?

a) 1/2

b) 1/4

c) 2/7

d) 3/7

e) 7/8

prob that she does not visit at all 0.5 * 0.5 * 0.5 = 0.125

prob that she visits atleast one = 1 - 0.125 = 0.875
Re: Probability of Getting a Girl to...   [#permalink] 30 Dec 2003, 19:46
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