The probability of the month of April in a non-leap year having $5$ Sundays is .... . (in $/7$)

Two unbiased dice are thrown once. Write all the possible outcomes of this experiment. What is the probability that the sum of numbers on two dice is a prime number?

In a carton of $20$ bulbs,$4$ bulbs are defective. Find the probability that a bulb selected at random is non-defective.

Chits numbered from $1$ to $100$ are put in a box and a chit is drawn randomly from the box. The probability that the chit drawn bears a $2$-digit number is ............

$A$ card is selected from a deck of $52$ cards. The probability of its being a red face card is

$A$ balanced die is rolled twice. Then,the probability of the event that an even number is received both the times is ..........