Probability Tes...

One card is drawn from each of two ordinary packs of 52 cards. The probability that at least one of them is an ace of heart, is

A box contains 6 nails and 10 nuts. Hals of the nails and half of the nuts are rusted. If one item is chosen at random, what is the probability that it is rusted or is a nail

Let A = {1, 3, 5, 7, 9}, B = {2, 4, 6, 8}, if a Cartesian product A × B choosen at random, the probability of a + b = 9 is

Three letters are to be sent to different persons and addresses on the three envelopes are also written. Without looking at the addresses, the probability that the letters go into the right envelope is equal to

Two dice are throw. The probability that the sum of number appearing is more than 10 is

A number is chosen at random among the first 120 natural numbers. The probability of the number chosen being a multiple of 5 or 15 is

The probability of a sure event is

The probability of happening an event A is one trail is 0.4. The probability that the event A happens at least once in three independent trials is

Let the probability that a better gets a hit is ¼. If he plays 4 bats the probability that he gets at least one hit is

From 10,000 lottery tickets numbered from 1 to 10,000 one ticket is drawn at random. What is the probability that the number marked on the drawn ticket is divisible by 20