Question 391271: There are a few red and a few green balls in a box. Without looking, you have to take out 7 of them in order to have at least one red for sure, and you have to take out 13 of them in order to have two different color balls for sure. How many red and how many green balls are there in the box?
Another question
There are 70 balls in a basket. 20 of them are red, 20 of them are green, 20 of them are yellow, and some of the remaining 10 are black and the rest of them are white. At least how many balls do you have to take out of the basket without looking in order to have 10 of the same color?
Answer by scott8148(6628)   (Show Source):
You can put this solution on YOUR website! "you have to take out 7 of them in order to have at least one red for sure" ___ this means 6 green balls
"you have to take out 13 of them in order to have two different color balls for sure" ___ this means 12 red balls
worst (longest) scenario ___ 9 red, then 9 green, then 9 yellow, then 10 black & white ___ the next ball will give 10 of one color
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