Test Index

Probability

Question : 62 of 127

Marks: +1, -0

Solution:

Concept:

Conditional probability: find probability of both girls given at least one girl.

Explanation:

The sample space for two children (order matters) is:

BB

BG

GB

GG

(each equally likely).

Given the family has a girl, we exclude

BB

The remaining outcomes are

BG

GB

GG

Only

GG

has the other child also a girl.

Thus, probability =

\frac{1}{3}

Answer:

\frac{1}{3}

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