A certain board game has a row of squares numbered 1 to 100. If a game : GMAT Problem Solving (PS)
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# A certain board game has a row of squares numbered 1 to 100. If a game

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Manager
Joined: 24 Nov 2010
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Concentration: Technology, Entrepreneurship
Schools: Ross '15, Duke '15
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Kudos [?]: 76 [0], given: 7

A certain board game has a row of squares numbered 1 to 100. If a game [#permalink]

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11 Dec 2011, 09:24
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A certain board game has a row of squares numbered 1 to 100. If a game piece is placed on a random square and then moved 7 consecutive spaces in a random direction, what is the probability the piece ends no more than 7 spaces from the square numbered 49?

(A) 7%
(B) 8%
(C) 14%
(D) 15%
(E) 28%
[Reveal] Spoiler: OA
Intern
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GMAT Date: 01-12-2012
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Kudos [?]: 7 [0], given: 1

Re: A certain board game has a row of squares numbered 1 to 100. If a game [#permalink]

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11 Dec 2011, 10:38
E?

1-P trick

Prob that you don't land within 14 spaces of 49 (1 to 34, so tech 35 and 64 to 100, so 37 spots- together 72 spots out of 100

1-72%= 28%

Manager
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Kudos [?]: 2 [0], given: 14

Re: A certain board game has a row of squares numbered 1 to 100. If a game [#permalink]

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11 Dec 2011, 22:06
OA is E

required prob is 7 spaces any side of 49.
so total 14 spaces are required in 7 moves which can be achieved by max 7 move on any side
so total spaces = 28
probability = 28%
Re: A certain board game has a row of squares numbered 1 to 100. If a game   [#permalink] 11 Dec 2011, 22:06
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