The probability of obtaining an even prime number on each die, when a pair of dice is rolled is
$\frac{1}{36}$
$\frac{1}{3}$
$\frac{1}{12}$
$0$
A card is drawn from a well shuffled pack of cards. The probability of getting a queen of club or king of heart is
Three letters are dictated to three persons and an envelope is addressed to each of them, the letters are inserted into the envelopes at random so that each envelope contains exactly one letter. Find the probability that at least one letter is in its proper envelope.
Three coins are tossed once. Find the probability of getting exactly $2$ tails.
Two dice are tossed. The probability that the total score is a prime number is
Three coins are tossed once. Find the probability of getting at most $2$ heads.