Two small squares on a chess board are chosen at random. Then, the probability that they have a common side,is

If two of the 64 squares are chosen at random on a chess board, the probability that they have a side in common is

Three numbers are chosen at random from 1 to 20 .The probability that they are consecutive is

On a chess board if two squares are chosen at random, what is the probability that they haven't a side in common?

If 4 squares are chosen at random on a chess board, the probability that they lie on a diagonal line is

Two squares of 1xx1 are chosen at random on a chestboard. What is the probability that they have a side in common ?

Two smallest squares are chose at random on a chess board and p/q is the probability that they have exactly one corner in common ( p and q are co-prime) then q-20p=

(i)If fuor squares are chosen at random on a chess board, find the proability that they lie on diagonal line. (ii) If two squares are chosen at random on a chess board, what is the Probability that they have exactly on corner in common? (ii) If nine squares are chosen at random on a chess board, what is the probability that they form a square of size 3x3?

Three squares of Chess board are selected at random. Find the probability of getting 2 squares of one colour and other of a different colour.

A is a set having n elements. A subset P of A is chosen at random. The set A is reconstructed by replacing the elements of A. A subset Q of A is again chosen at random. Find the probability that P and Q have no common elements.

Out of 20 consecutive numbers, two are chosen at random, the probability that their sum is odd is