Question 391271
"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