While playing a certain dice game, Chris wins if the sum of

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by M7MBA » Fri Apr 05, 2019 11:33 am

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While playing a certain dice game, Chris wins if the sum of the two dice is 7, at which point the game is over. If the game allows Chris three rolls in an attempt to win, what is the probability that Chris will win?

A. 1/2
B. 17/36
C. 91/216
D. 11/36
E. 25/216

[spoiler]OA=C[/spoiler]

Source: Veritas Prep

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Source: Beat The GMAT — Problem Solving | Fri Apr 05, 2019 11:33 am

GMATinsight: Legendary Member; Posts: 1100; Joined: Sat May 10, 2014 11:34 pmFollowed by: 24 members; Location: New Delhi, India; Thanked: 205 times

by GMATinsight » Fri Apr 05, 2019 11:28 pm

M7MBA wrote:While playing a certain dice game, Chris wins if the sum of the two dice is 7, at which point the game is over. If the game allows Chris three rolls in an attempt to win, what is the probability that Chris will win?

A. 1/2
B. 17/36
C. 91/216
D. 11/36
E. 25/216

[spoiler]OA=C[/spoiler]

Source: Veritas Prep

The possible results of the two dice = 6*6 = 36

Favourable cases of sum 7 = (1,6)(2,5)(3,4)(4,3)(5,2)(6,1) = 6 cases

Probability of him winning in each throw = 6/36 = 1/6

i,.e. Probability of him not winning in each throw = 1-(1/6) = 5/6)

One chance includes three throws

Probability of winning ina chance = 1- (probability of not winning in a chance i.e. three throws) = 1-(5/6)*(5/6)*(5/6) = 1- (125/216) = 91/216

Answer: Option C

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