a box contains 7 purple , 5 blue and 11 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 choices
A) 16
B) 17
C) 18
D) 19
E) 20

Rationale: 11 yellow + 7 purple + after that we have only one option that is to be blue so answer is 19 answer : d
Answer: D