Probability Tes...

Mean number of ' sixes' in four throws of a fair dice is

A coin is tossed once. If a head comes up , then it is tossed again and if a tail comes up , a dice is thrown . The number of points in the sample space of experiment is

Five letters are sent to different persons and addresses on the five envelopes are written at random. The probability that all the letters reach the correct destiny is

A coin with tail on both sides is tossed twice. The probability of getting ' a head' is

The probability of the having atleast one tail in 4 tosses with a coin is

A digit is selected at random from either of two sets {1, 2, 3, 4, 5, 6, 7, 8, 9} and {1, 2, 3, 4, 5, 6, 7, 8, 9}. What is the chance that the sum of the digits selected is 10?

A cubical dice has 3 on three faces, 2 on two faces and 1 on the 6th face .It is tossed twice. The chance that both the tosses show an even number is

Three fair dice are tossed once. The probability that they show the same numbers  is

Probability of getting a number between 1 and 100, which is divisible by 1 and itself only, is

Probability of getting a number between 1 and 100, which is divisible by 1 and itself only, is

The chance that an event E ' occurs' or ' does not occur' is

A coin is tossed 6 times. The probability of getting a head three times is

From a deck of 52 cards, the probability of drawing a court card is

Three letters are written to different persons and addresses on the envelopes are also written. Without looking at the addresses, the letters are put into the envelopes. The probability that the letters go into right envelopes is

From each of the four married couples, one of the parteners is selected at random. The probability that those selected are of the same sex is