
probability
Grace has 16 jellybeans in her pocket. She has 8 red ones, 4 green ones, and 4 blue ones. What is the minimum number of jellybeans she must take out of her pocket to ensure that she has one of each color?
is there a certain rule to answer quesions like these?!

3 colors
You just have to use some logic:
She has 8 red ones, 4 green ones, and 4 blue ones.
In the worst case the first 8 jellys would all be red, and the next 4 would all be either all green or all blue.
It is possible to have taken out 12 jellys and still not have all colors.
But once she takes out lucky 13 there is no possible way for her to NOT have all three colors.