If two dice are thrown, then what is the probability that the sum on the two faces is greater than or equal to 4?

A certain type of missile hits the target with probability p = 0.3. What is the least number of missiles should be fired, so that there is at least an 80% probability that the target is hit?

For two mutually exclusive events A and B, P(A) = 0.2 and P($$\overline A $$ $$\cap$$ $$\overline B $$) = 0.3. What is P(A / (A $$\cup$$ B)) equal to ?

What is the probability of 5 Sunday in the month of December ?