The probability of a non-leap year having $53$ Fridays is $\ldots \ldots \ldots$

$A$ balanced die is rolled twice. Then,the probability that the sum of numbers received in two trials is $12$ or less than $12$ is ...........

The probability of any event cannot be ..........

There are $1000$ sealed envelopes in a box,$10$ of them contain a cash prize of $Rs. 100$ each,$100$ of them contain a cash prize of $Rs. 50$ each,$200$ of them contain a cash prize of $Rs. 10$ each,and the rest do not contain any cash prize. If they are well shuffled and an envelope is picked out,what is the probability that it contains no cash prize?

$A$ game of chance consists of spinning an arrow which comes to rest pointing at one of the numbers $1, 2, 3, \dots, 11, 12$ on a circular disc. All these outcomes are equally likely. Then, the probability that the arrow rests to point at $7$ is ..........

$A$ balanced die is thrown once. Find the probability of getting a number greater than $4$.