If four marbles are picked at random, what is the probability that one is green, two are blue and one is red?
If three marbles are picked at random, what is the probability that two are blue and one is yellow?
If two marbles are picked at random, what is the probability that both are red?
If four marbles are picked at random, what is the probability that at least one is blue?
In given below which one of the five answer figures on the right should come after the problem figures on the left, if the sequence were continued ?
