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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
a) 1/2
b) 1/4
c) 2/7
d) 3/7
e) 7/8
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30 Dec 2003, 19:03
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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
