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You have 40 balls in a bag: 15 identical blue, 12 identical black, and 13 identical red. You are not allowed to look inside the bag. How many balls must you take out from the bag to be sure that 100 percent
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2 votes
You have 40 balls in a bag: 15 identical blue, 12 identical black, and 13 identical red. You are not allowed to look inside the bag. How many balls must you take out from the bag to be sure that 100 percent you get one blue ball?

40

15

12

26

User Baversjo
by
7.4k points

2 Answers

4 votes
You have to take out 26 of the balls
User Biswajit Maji
by
8.9k points
3 votes
To have at least one blue ball you mush take out 26 of the balls.
User Duncan Bayne
by
8.3k points
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