Bella keeps a supply of red, blue, and black pens in a drawer. The drawer has 17 red pens, 18 blue pens, and 11 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?
1 answer
Think. If all the black and blue pens are drawn first, how many is that? The next pen MUST be a red one.
2 answers