In a workshop,there are five machines.The probability of any one of them to be out of service on a day is `(1)/(4)`.If the probability that at most two machines will be out of service on the same day is` ((3)/(4))^(3)k` ,then` k` is equal to

In a hospital,there are 20 kidney dialysis machines and that the chance of any one of them to be out of service during a day is 0.06 . determine the probability that exactly 3 machines will be out of service on the same day.

In a hospital,there are 5 dialysis machines. The chance of any one of them being during a day is (1)/(10) .Find the probability that two machines will be out of order on the same day, What is defectivethe that atprobability least one machine in order?

In a hospital,there are 4 dialysis machines. The chance of any one of them being defective during a day is.(1)/(6), Find the probability that at least two machines will be in working order out of 4 so that at least two patients may use the dialysis machine.

The probability of any ship return safely to the port is (1)/(5). Find the probability that the returning out of 4 ships,

* In a race,the probability of A to win the race is (1)/(7) and of B is (1)/(4). Find the probability that any one of them win the race

There are 5 machines. Probability of a machine being faulted is 1/4 . Probability of atmost two machines is faulted, is (3/4)^3 k , then value of k is

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

If 4 people are chosen at random, then find the probability that no two of them were born on the same day of the week

The probability that it will rain on any particular day is 50%. Find the probability that it rains only on first 4 days of the week.