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Manager
Joined: 24 Nov 2010
Posts: 216
Location: United States (CA)
Concentration: Technology, Entrepreneurship
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28
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Question Stats:
0% (00:00) correct
 0% (00:00) wrong based on 0 sessions
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%
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Intern
Joined: 22 Nov 2011
Posts: 9
Location: United States
GMAT Date: 01-12-2012
GPA: 3.17
WE: Sales (Investment Banking)
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Re: board game prob. [#permalink]
 11 Dec 2011, 11:38
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%
Please help me here...my first stab trying to stay close to 2 min mark. Thx
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Manager
Joined: 26 Apr 2011
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Re: board game prob. [#permalink]
11 Dec 2011, 23:06
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%
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Re: board game prob.
[#permalink]
11 Dec 2011, 23:06
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