The bead problem
Logic
Level
2
Lisa has some marbles in a bag. 6 are red, 8 are green, and 10 are blue. What is the least amount of marbles she has to take out to be certain that she will take out 3 red?
The answer is 21.
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1 solution
8+10=18 18+3=21 She can take out all blue and green and then take out 3 red.