A Bag Contains 20 Balls: 5 Are Red, 5 Are Blue, 5 Are Green, And 5 Are Yellow., What Is The Least Number Of A Blind-Folded Person Must Get To Be Certain Of Getting

A bag contains 20 balls: 5 are red, 5 are Blue, 5 are Green, and 5 are yellow.

what is the least number of a blind-folded person must get to be certain of getting
at least one of each color

with solution

  The answer is 16 balls

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