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# In a certain game, a one-inch square piece is placed in the

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Senior Manager
Joined: 07 Jan 2008
Posts: 318
Location: Ann Arbor, Michigan
Schools: Ross Class of 2011
Followers: 6

Kudos [?]: 94 [0], given: 0

In a certain game, a one-inch square piece is placed in the [#permalink]  21 May 2008, 12:13
In a certain game, a one-inch square piece is placed in the lower left corner of an eight-by-eight grid made up of one-inch squares. If the piece can move one grid up or to the right, what is the probability that the center of the piece will be exactly 4sqrt(2) inches away from where it started after 8 moves?

24/256

64/256

70/256

128/256

176/256
Current Student
Joined: 28 Dec 2004
Posts: 3391
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

Kudos [?]: 181 [0], given: 2

Re: Probability - game [#permalink]  21 May 2008, 14:03
lsuguy7 wrote:
In a certain game, a one-inch square piece is placed in the lower left corner of an eight-by-eight grid made up of one-inch squares. If the piece can move one grid up or to the right, what is the probability that the center of the piece will be exactly 4sqrt(2) inches away from where it started after 8 moves?

24/256

64/256

70/256

128/256

176/256

ouch..

OK so i know the total out comes are 2^8...i can either go up or left..

there are 8 upward tracks..and 8 side tracks.. we are asked how can the tile be at the dead center..that means it will have to travel 4 ups..and 4 lefts..

ok so if the tile is on the corner..it has 7C4 ways to go up and 7C4 ways to go left..i.e total ways =70..

70/256 is my guess
Manager
Joined: 01 May 2008
Posts: 114
Location: São Paulo
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Re: Probability - game [#permalink]  21 May 2008, 17:32
Can anyone explain to me what does 7C4 mean?

Thanks!
Senior Manager
Joined: 07 Jan 2008
Posts: 318
Location: Ann Arbor, Michigan
Schools: Ross Class of 2011
Followers: 6

Kudos [?]: 94 [0], given: 0

Re: Probability - game [#permalink]  21 May 2008, 18:00
Nicely done guys - C is the OA.

I can't imagine seeing a question like this on the real thing it just hurts my face to read it.
Re: Probability - game   [#permalink] 21 May 2008, 18:00
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