The first name of a person consists of 9 letters in which one letter occurs more than once and the other letters are different. If the number of permutations of the letters of his name taken all at a time be 15120, find the number of times the like letter occurs.

The first name of a person consists of 9 letters in which one letters occurs more than once and the other letters are different . If the numbers of permutations of the letters of his name taken all at a time be 15120 , find the number of times the like letters occurs .

The first name of a person consists of 8 letters in which one letter occurs more than once while the other letters are different . If the number of permutations of the letters of his name taken all at a time be 6720 , find the number of times the like letter occurs.

The number of permutations of the letters of the word SIMPLETON taken all at a time is :

The number of permutations of the letters of the word 'INDEPENDENT taken 5 at a time is

The number of other permutations of the letters of the word SIMPLETON taken all at a time is

Find the number of permutations of the letters x,x,x,y,y,y,z,w taken 5 at a time.

The number of other permutations of the letters of the word SIMPLETON taken all at a time is :