Slapped!!

Algebra Level 1

The probability of a boy being slapped by the 1st girl is 2/3.Now,if he gets slapped by the 1st one then the probability of him being slapped by the 2nd girl standing next becomes 3/4.But if not,then the probability of being slapped by 2nd is 1/3.Then find the probability of him being slapped by the 2nd girl.(Consider that he can approach the 2nd only after approaching the 1st.)

3/4 11/18 5/6 7/12

Saaket Sharma by Saaket Sharma , 22, India

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2 solutions

Saaket Sharma
Dec 15, 2014

This is conditional probability.Ans:{(2/3)x(3/4)}+{(1/3)x(1/3)}=11/18

1 Helpful 0 Interesting 0 Brilliant 0 Confused

Thanks. I have updated the answer to 11/18.

As the problem creator, you can report that "The answer is incorrect", and state what the correct answer should be (preferably along with an explanation), and it will be updated it accordingly.

Calvin Lin Staff - 6 years, 6 months ago

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Thanks.Are you a part of brilliant staff?

Saaket Sharma - 6 years, 5 months ago

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Yes I am.

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Calvin Lin Staff - 6 years, 5 months ago

The solution should be (2/3x3/4 + 1/3x1/3)=11/18. But there is no such option. Otherwise the question is wrong.

0 Helpful 0 Interesting 0 Brilliant 0 Confused

pardon me....i made a calculation mistake.Your and my answers are the same.The right answer is 11/18.thanks

Saaket Sharma - 6 years, 6 months ago

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