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# DS - Pizza

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Senior Manager
Joined: 14 Aug 2006
Posts: 365
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DS - Pizza [#permalink]  13 Dec 2006, 10:06
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Attachments

pr_4_24.GIF [ 4.4 KiB | Viewed 535 times ]

Senior Manager
Joined: 08 Jun 2006
Posts: 342
Location: Washington DC
Followers: 1

Kudos [?]: 24 [0], given: 0

Getting B
x = 7

From 1)
X C 2 = X C X-2
Canâ€™t find the value of X

From 2)
X + 1 C 4 = 2 * X C 4
Getting X = 7
Senior Manager
Joined: 14 Aug 2006
Posts: 365
Followers: 1

Kudos [?]: 3 [0], given: 0

great job guys..
OA is B

I read the question as the number of different pizzas that could be made with 4 toppings as:

4 - single toppings
4c 2 - two toppings
4 c 3 - three toppings
4c 4 - 4 toppings
Manager
Joined: 28 Aug 2006
Posts: 245
Location: Albuquerque, NM
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nice question, what is the source?
Intern
Joined: 21 Nov 2006
Posts: 44
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What is the 7C4 8C4? I mean what is the C? Is it combination? I guess not as the number doesnt work. I havent been on here enough to pick up the shorthand.

Thanks
Eric
Intern
Joined: 02 Jan 2007
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Just trying to understand this problem took me a long time (>3 minutes). Maybe it is wording.

Once I figured out it was a combination problem the rest was easy. But if I see a problem like this on the test I would not be able to recognize it fast enough and probably would have guessed.
Senior Manager
Joined: 24 Nov 2006
Posts: 351
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I also had a bit of a problem with the wording.

(1) is actually an identity that holds for any X >= 2; that is, XC2 = XC(X-2) for each X >=2.
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