$A$ card is selected from a pack of $52$ cards. Calculate the probability that the card is an ace.

$A$ bag contains $3$ red and $3$ white balls. If two balls are drawn one after another,what is the probability that they are of different colors?

Two dice are thrown simultaneously. The probability of getting a multiple of $2$ on one die and a multiple of $3$ on the other die is

The probability of obtaining an even number on each die,when a pair of dice is rolled is . . . . . . .

In a simultaneous throw of three coins,what is the probability of getting at least $2$ tails?

Let $A$ be the event that the absolute difference between two randomly chosen real numbers in the sample space $[0, 60]$ is less than or equal to $a$. If $P(A) = \frac{11}{36}$,then $a$ is equal to $...............$.