The letters of the word ‘SOCIETY’ are placed at random in a row. What is the probability that the three vowels come together ?

The first twelve letters of the alphabet are written down at random . What is the probability that there are four letters between the A and the B?

A die is thrown twice. What is the probability that : 5 will not come up either time ?

A die is thrown twice. What is the probability that : 5 will come up atleast once ?

If the letters of the word ASSASSIN are written down in a row, the probability that no two S's occur together, is

In a drawer there are four white socks, three blue socks and five grey socks. Two socks are picked at random. What is the probability that both the socks are of same colour?

If 6 boys and 6 grils sit in a row at random, then the probability that all the girls sit together is

Three of the six vertices of a regular hexagon are chosen the random. What is the probability that the triangle with these vertices is equilateral.

(i)If four squares are chosen at random on a chess board, find the probability 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? (iii) If nine squares are chosen at random on a chess board, what is the probability that they form a square of size 3x3?

If a letter is Chosen at random from the English alphabet, find the probability that the letter is : a vowel.