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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 From a group of $$J$$ employees, $$K$$ will be selected, at tagged by: swerve This topic has 1 expert reply and 0 member replies Top Member From a group of $$J$$ employees, $$K$$ will be selected, at Timer 00:00 Your Answer A B C D E Global Stats Difficult From a group of $$J$$ employees, $$K$$ will be selected, at random, to sit in a line of $$K$$ chairs. There are absolutely no restrictions, either in the selection process nor in the order of seating - both are entirely random. What is the probability that the employee Lisa has seated exactly next to employee Phillip? 1) $$K = 15$$ 2) $$K = J$$ The OA is C Source: Magoosh GMAT/MBA Expert GMAT Instructor Joined 02 Jun 2008 Posted: 2475 messages Followed by: 351 members Upvotes: 1090 GMAT Score: 780 Using only Statement 1, we might be picking only from 15 employees in total, in which case it's not likely, but also not nearly impossible, that Lisa and Philip sit together. But we might be picking from 15,000,000 employees in total, and the probability might be almost zero that we even pick Lisa or Philip to sit down, let alone that they are seated together. Using only Statement 2, it might be true that Lisa and Philip are the only two employees (K = J = 2), and it might be absolutely certain they sit together, or we might have more than 2 employees in which case the probability will be less than 1 that they sit together. But once we use both statements, we know all our numbers, so of course we can answer any question. _________________ If you are looking for online GMAT math tutoring, or if you are interested in buying my advanced Quant books and problem sets, please contact me at ianstewartgmat at gmail.com • Magoosh Study with Magoosh GMAT prep Available with Beat the GMAT members only code • 1 Hour Free BEAT THE GMAT EXCLUSIVE Available with Beat the GMAT members only code • Free Veritas GMAT Class Experience Lesson 1 Live Free Available with Beat the GMAT members only code • Free Trial & Practice Exam BEAT THE GMAT EXCLUSIVE Available with Beat the GMAT members only code • FREE GMAT Exam Know how you'd score today for$0

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