A) \[\frac{1}{11}\]
B) \[\frac{1}{17}\]
C) \[\frac{1}{10}\]
D) \[\frac{1}{12}\]
Correct Answer: A
Solution :
\[P\left( B \right)=P\left( G \right)=1/2\] Required Proballity = \[\frac{\text{all 4girls}}{\left( \text{all 4girls} \right)\text{ (exactly+3girls+1boy)+(exactly2girls+2boys)}}\] \[=\frac{{{\left( \frac{1}{2} \right)}^{4}}}{{{\left( \frac{1}{2} \right)}^{4}}{{+}^{4}}{{C}_{3}}{{\left( \frac{1}{2} \right)}^{4}}{{+}^{4}}{{C}_{2}}{{\left( \frac{1}{2} \right)}^{4}}}=\frac{1}{11}\]You need to login to perform this action.
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