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100 points for $49 worth of Veritas practice GMATs FREE VERITAS PRACTICE GMAT EXAMS Earn 10 Points Per Post Earn 10 Points Per Thanks Earn 10 Points Per Upvote ## There are 5 competitors in a race (John, mary and... tagged by: AAPL ##### This topic has 2 expert replies and 0 member replies ### Top Member ## There are 5 competitors in a race (John, mary and... There are 5 competiros in a race (John, Mary and 3 other ones) in which there are no ties, what is the probability that Mary finish ahead of John? A) 1/6 B) 1/3 C) 1/2 D) 2/3 E) 5/6 The OA is C. Please, can any expert assist me with this PS question? I don't have it clear and I appreciate if any explain it for me. Thanks. ### GMAT/MBA Expert Legendary Member Joined 14 Jan 2015 Posted: 2667 messages Followed by: 122 members Upvotes: 1153 GMAT Score: 770 AAPL wrote: There are 5 competiros in a race (John, Mary and 3 other ones) in which there are no ties, what is the probability that Mary finish ahead of John? A) 1/6 B) 1/3 C) 1/2 D) 2/3 E) 5/6 The OA is C. Please, can any expert assist me with this PS question? I don't have it clear and I appreciate if any explain it for me. Thanks. Well, if we assume that the outcomes are all random, then there are only 2 possibilities: Mary finishes ahead of John or John finishes ahead of Mary, so there's a 1/2 chance that Mary finishes ahead of John. (Of course, if one of them is actually faster than the other, well that would create a bit of uncertainty.) _________________ Veritas Prep | GMAT Instructor Veritas Prep Reviews Save$100 off any live Veritas Prep GMAT Course

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DavidG@VeritasPrep wrote:
(Of course, if one of them is actually faster than the other, well that would create a bit of uncertainty.)
No uncertainty here: if I'm getting even odds, give me the faster runner for the max.

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