A box contains seven purple, five blue and eleven yellow balls.
What is the minimum number of tries required to get one blue and one yellow ball ?  Choose the correct choice from the following: A) 16 B) 17 C) 18 D) 19 E) 20
11 yellow+7 purple+after that we have only one option that is to be blue so answer is 19   ANSWER:19
<result>D</result>
A box contains seven purple, five blue and eleven yellow balls.
What is the minimum number of tries required to get one blue and one yellow ball ?