The probability of obtaining a sum of $8$ in a single throw of two dice 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 all the letters go into the right envelope is equal to

$A$ coin is tossed and a dice is rolled. The probability that the coin shows the head and the dice shows $6$ is

In order to get at least one head with a probability $\ge 0.9$,the minimum number of times a coin needs to be tossed is:

In a single throw of two dice,the probability of obtaining an odd number as the sum is

If two regular six-sided dice are thrown,the probability that the sum will be a prime number is