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21 Sep 2019, 10:20
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sakgoel
Multiply it by 1/2 as there are two possibilities
mehro023
Current Student
Joined: 08 Nov 2019
Last visit: 10 Dec 2021
Posts: 50
Own Kudos:
Given Kudos: 1,158
Location: United States (MN)
Concentration: Finance, International Business
GMAT 1: 580 Q47 V22
GMAT 2: 650 Q49 V29 (Online)
GMAT 3: 680 Q49 V33
GMAT 4: 710 Q49 V38
GMAT 5: 730 Q50 V40
GPA: 3.29
WE:Architecture (Other)
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19 May 2020, 19:22
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BrentGMATPrepNow
Hi Brent,
Why arent we multiplying with 2 in this case ? Why can we not pick law school sibling first and then business ? wouldnt that make the answer to be B ?
Thanks,
K
05 Dec 2020, 09:45
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Probability of choosing one of the sibling pairs from business school = \(\frac{30}{500}\)
Probability of choosing one of the MATCHING pairs from law school = \(\frac{1}{800}\) (notice that it's 1 and not 30 because the other sibling pairs are related to the one we chose)
\(\frac{30}{500}\) * \(\frac{1}{800 }\) = \(\frac{3}{40,000}\)
Answer is A.
Probability of choosing one of the MATCHING pairs from law school = \(\frac{1}{800}\) (notice that it's 1 and not 30 because the other sibling pairs are related to the one we chose)
\(\frac{30}{500}\) * \(\frac{1}{800 }\) = \(\frac{3}{40,000}\)
Answer is A.
