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Hi,

I am struggling on a question and any help given would be much appreciated. Here it is:

A class consists of seven boys and nine girls two different members of the class are chosen at random. A is the event that {the first person is a girl} and B is the event that {the second person is a girl}. Find the probability of of B given A' (B/A')

Thanks Jack

I am struggling on a question and any help given would be much appreciated. Here it is:

A class consists of seven boys and nine girls two different members of the class are chosen at random. A is the event that {the first person is a girl} and B is the event that {the second person is a girl}. Find the probability of of B given A' (B/A')

Thanks Jack

Jack

Hi,

I am struggling on a question and any help given would be much appreciated. Here it is:

A class consists of seven boys and nine girls two different members of the class are chosen at random. A is the event that {the first person is a girl} and B is the event that {the second person is a girl}. Find the probability of of B given A' (B/A')

Thanks Jack

I am struggling on a question and any help given would be much appreciated. Here it is:

A class consists of seven boys and nine girls two different members of the class are chosen at random. A is the event that {the first person is a girl} and B is the event that {the second person is a girl}. Find the probability of of B given A' (B/A')

Thanks Jack

A' is the complement of A--i.e. A' is the event that the first person is a boy, so that P(A')=7/16.

P(B|A')=P(B n A')/P(A')=P(B and A')/P(A')=P(second person girl AND first person boy)/P(A')=(7/16).(9/15)/(7/16)=9/15

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