Bella's Pen Pecularity
Probability
Level
2
Bella keeps a supply of red, blue, and black pens in a drawer. The drawer has 13 red pens, 18 blue pens, and 8 black pens. If Bella wants a red pen, what is the minimum number of pens she has to pull out from the drawer to make sure she gets a red pen?
The answer is 27.
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1 solution
Using the worst case scenario, Bella will DEFINITELY get a Red pen after the 26th try ( 18 blue + 8 black)