A bag contains 20 balls. 8 balls are green, 7 are white and 5 are red. What is the minimum number of balls that must be picked up from the bag blindfolded (without replacing any of it) to be assured of picking at least one ball of each colour?
A
17
B
16
C
13
D
11
Correct Answer: Option B
Explanation
1. **Analyze the Goal**: I need at least one ball of each color (Green, White, Red). The question asks for the number of picks to be 'assured' of this. As per PYQ analysis, 'assured' or 'must be t