A box contains 4 blue, 3 red, 5 green and 6 yellow marbles. If three marbles are drawn at random, what is the probability that at least one is green?

Guess me :

Violet, indigo, blue and green, yellow, orange and red; these are my colors you see after the storm has fled.

What am I?

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls will you have to pick up so that you have at least 4 balls of the same colour?