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Found these on mygretutor : Very good for practice (GMAT and

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Found these on mygretutor : Very good for practice (GMAT and [#permalink] New post 19 Aug 2007, 18:02
Found these on mygretutor : Very good for practice (GMAT and GRE overlap significantly).

1)
Column A

A box contains 32 short pencils and 12 long pencils. The probability of picking 2 pencils, the first of which is short and the second one is long.

Column B

30%

-I got (32/44)*(12/43) which is greater than 30%.

2)
2x + 4y = 16
3x + 6y = 30
Column A

|x|

Column B

|y|

-I believe there is a mistake here. The first equation is the second equation divided by 3/2, but the numbers don't match on the right-hand side.

3) Column A

A vegetarian sandwich shop has a choice of 4 different sandwich toppings. The number of different types of sandwiches that can be made if at least one topping has to be used and each topping cannot be used more than once.

Column B
32

- I got 15, by adding 4 C 1 + 4 C 2 + 4 C 3 + 4 C 4 (where 4 C y stands for combination). But they say that's wrong.


I'm very worried about these questions. i would very much appreciate the help.
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Joined: 07 Jul 2004
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Location: Singapore
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 [#permalink] New post 19 Aug 2007, 18:05
I have no idea what you're asking, and what column A is and what column B is, and where the questions are. Try posting it as a word document attachement.
  [#permalink] 19 Aug 2007, 18:05
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Found these on mygretutor : Very good for practice (GMAT and

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