Flashcards - page 57 : GMAT Quantitative Section
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# Flashcards - page 57

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Intern
Joined: 08 Jun 2012
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26 Jul 2012, 13:46
Hi,

Forgive me if I am posting this in the wrong section, and also forgive me if this question has been asked before! I couldn't find anywhere in the search engine where this question is answered.

On page 57 of the flashcards, there are two questions: "If there are 5 chairs in a room and Bob and Rachel want to sit so that Bob is always left of Rachel, in how many ways this seating arrangement be achieved?" and "In how many different ways can a group of 8 people be divided into 4 teams of 2 people each?"

The answers provide enough explanation, however I do not know how to calculate the solution. (did I miss this somewhere else?) - how do you calculate N = 1/2 x P (2,5) and how do you calculate the formula c (2,8) x c (2,6) x c(2,4) x c(2,2) / 4!?

I know how to calculate the 4 factorial, but I do not know how to calculate the other parts. Thank you for any guidance!
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Re: Flashcards - page 57 - FLASH CARD PAGE 57 and 9 IS INCORRECT [#permalink]

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13 Aug 2012, 18:42
After driving myself and a few other people crazy, we figured out that the flash card is actually incorrect in not only the question I am referencing below, but also there is a mistake in another slide.

Page 57 - bottom right slide - Combinations 6 Answer is incorrect. The formula has the numbers inverted. It should be C8,2 (not 2,8) X C6, 2 (not 2, 6), etc, etc.

Also. on page 92, top right slide - Parallelism Sub Type/Parallel Conjunctions: The correct answer is "The restaurant not only hired a new chef, but also expanded its seating capacity." I believe this is also incorrect, because there should not be a comma before the conjunction "but."
Re: Flashcards - page 57 - FLASH CARD PAGE 57 and 9 IS INCORRECT   [#permalink] 13 Aug 2012, 18:42
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