SOLUTION: There are 8 blue balls, 8 yellow balls and 8 red balls of the same type inside a sack. How many balls must be pulled out to ensure that we get a pair of yellow balls?

Question 1024478: There are 8 blue balls, 8 yellow balls and 8 red balls of the same type inside a sack. How many balls must be pulled out to ensure that we get a pair of yellow balls?
Answer by ikleyn(52777) (Show Source): You can put this solution on YOUR website!
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There are 8 blue balls, 8 yellow balls and 8 red balls of the same type inside a sack. How many balls must be pulled out to ensure that we get a pair of yellow balls?
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8 + 8 + 2 = 18 balls.

In the worst case you will pull out 8 blue balls and 8 red balls before first yellow ball will arise.

But after that you will pull out only yellow balls, in reward!

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