The number of ways in which 6 distinct things can be distributed into 2 boxes so that no box is empty is

Number of ways in which the number 831600 can be split into two factors which are relatively prime is

If 4 letters are selected at random from the letters of the word PROBABILITY, then the probability of getting a combination of letters in which atleast one letter is repeated is

The number of ways of arranging all the letters of the word 'COMBINATIONS' around a circle so that no two vowels together is