A pair of fair dice is rolled. What is the probability that the second dice lands on a higher value than does the first?

A fair coin is tossed and an unbiased dice is rolled together. What is the probability of getting a 2 or 4 or 6 along with head?

If A, B and C are three events, then what is the probability that at least two of these events occur together?

Two independent events A and B are such that P(A $$\cup$$ B) = $${2 \over 3}$$ and P(A $$\cap$$ B) = $${1 \over 6}$$. If P(B) < P(A), then what is P(B) equal to ?