In a simultaneous toss of $2$ coins,find the probability of getting $2$ tails.

Two cards are drawn at random from a pack of $52$ cards. The probability that both are the cards of spade is

In a single throw of $2$ dice,find the probability of getting a total of $12$.

$A$ bag contains $5$ white,$7$ black and $4$ red balls. Three balls are drawn from the bag at random,then the probability that all the three balls are white,is

Out of $30$ consecutive numbers,$2$ are chosen at random. The probability that their sum is odd,is

$A$ box contains $25$ tickets numbered $1, 2, \dots, 25$. If two tickets are drawn at random,then the probability that the product of their numbers is even is: