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Jim and Renee will play one game of Rock, Paper, Scissors. In this game, each will select and show a hand sign for one o

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by BTGModeratorVI » Wed Dec 16, 2020 12:49 pm

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Jim and Renee will play one game of Rock, Paper, Scissors. In this game, each will select and show a hand sign for one of the three items. Rock beats Scissors, Scissors beat Paper, and Paper beats Rock. Assuming that both Jim and Renee have an equal chance of choosing any one of the hand signs, what is the probability that Jim will win?

A. 5/6
B. 2/3
C. 1/2
D. 5/12
E. 1/3

Answer: E
Source: Manhattan prep
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Re: Jim and Renee will play one game of Rock, Paper, Scissors. In this game, each will select and show a hand sign for o

by Brent@GMATPrepNow » Tue Dec 22, 2020 6:12 am
BTGModeratorVI wrote: ↑
Wed Dec 16, 2020 12:49 pm
 Jim and Renee will play one game of Rock, Paper, Scissors. In this game, each will select and show a hand sign for one of the three items. Rock beats Scissors, Scissors beat Paper, and Paper beats Rock. Assuming that both Jim and Renee have an equal chance of choosing any one of the hand signs, what is the probability that Jim will win?

A. 5/6
B. 2/3
C. 1/2
D. 5/12
E. 1/3

Answer: E
Source: Manhattan prep
Here's one way to look at it.
Let's say that Renee already knows what she is going to select. So, that part is done.

At this point, what are the possible outcomes?
a) Jim selects the one sign that allows him to win
b) Jim selects the one sign that allows Renee to win
c) Jim selects the one sign that results in a tie.

Since each of these outcomes is equally likely, the probability of each outcome is 1/3
So, the probability that Jim wins is 1/3

Answer: E
Brent Hanneson - Creator of GMATPrepNow.com
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