If one out of 10 coming ships is wrecked. Find the probability that out of five coming ships at least 4 reach safely.

A die is thrown twice. Find the probability that: 5 will come up at least once

The probability that out of 5 ship is wrecked by enemies is (1)/(5). The probability that out of 5 ships,at least 4 will is arrive safely after the journey,is

A die is thrown twice . What is the probability that : 3 will come up at least once ?

A die is rolled twice. Find the probability that 4 will come up exactly one time.

The probability of any ship return safely to the port is 1/5 .Find the probability that the returning out of 5 ships,at least 3 ships returns safely.It is given that returning ships are independently.

The probability that a ship safely reaches a port is (1)/(3) . The probability that out of 5 ships, at least 4 ships would arrive safely is

The probabilities of two students A and B coming to the school in time are 3/7" " and 5/7 respectively. Assuming that the events, A coming in time and B coming in time are independent, find the probability of only one of them coming to the school in time. Write at least one advantage of coming to school in time.

Two coins are tossed. What is the probability of coming up two heads if it is known that at least on head comes up.