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One person has 2 child.At least one of them was a girl.Then the Probability that 2 of the are girl is_____

One person has 2 child.At least one of them was a girl.Then the Probability that 2 of the are girl is_____

Grade:11

2 Answers

Anil Pannikar AskiitiansExpert-IITB
85 Points
10 years ago

 

Dear Sairam,

 

Prob of a boy is 1/2 and girl is 1/2

according to ques.  atleast one child is girl and other is also girl so

Prob = 1 * 1/2 = 1/2

 

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Askiitians Expert

Anil Pannikar

IIT Bombay

Sudheesh Singanamalla
114 Points
10 years ago

A Person can have a boy or a girl as a child

so therefore

sample space = { BB ,BG,GB,GG }

 

therefore probabilty that both are girls is 1/4

 

approve the answer if its right

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