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a question from the GMATCLUB forsaleqeustions:
what is the prob of bearing two boys from four born babies ?
a. 1/5
b. 1/8
c. 1/2
d. 3/8
e. 6/11
what is the prob of bearing two boys from four born babies ?
a. 1/5
b. 1/8
c. 1/2
d. 3/8
e. 6/11
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11 Nov 2004, 04:31
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D) 3/8
Prob of getting boy: 1/2
Prob of getting girl: 1/2
Prob of getting exactly 2 boys and 2 girls: (1/2)^4
Pattern: BBGG --> 2 boys can take 4C2=6 different positions
Answer is 6/16 = 3/8
Prob of getting boy: 1/2
Prob of getting girl: 1/2
Prob of getting exactly 2 boys and 2 girls: (1/2)^4
Pattern: BBGG --> 2 boys can take 4C2=6 different positions
Answer is 6/16 = 3/8
