probability of an outcome

Question

there are 13 red balls and 2 blue balls. you can take 3 balls, what is the chance that you get both blue balls?

Answer 1

The is a hypergeometric distribution problem

$\left(\genfrac{}{}{0ex}{}{13}{1}\right)\ast \left(\genfrac{}{}{0ex}{}{2}{2}\right)/\left(\genfrac{}{}{0ex}{}{15}{3}\right)$