Seven girls and three boys are standing in a line randomly. What is the probability that three boys are next to each other? 
Overseas Competition->Knowledge Point->Counting Modules->Statistics and Probability->Questions Involving Probability->Basic Concepts of Probability
$\dfrac{A\_8^{8}\times A\_3^{3}}{A\_{10}^{10}}=\dfrac{6}{90}=\dfrac{1}{15}$ 