Number of four digit numbers in which at least one digit occurs more than once, is :

Find number of four-digit numbers in which repetition is not allowed. Also find number of four-digit numbers in which at least one digit is repeated.

Find number of four-digit numbers in which repetition is not allowed. Also find number of four-digit numbers in which at least one digit is repeated.

Find number of four-digit numbers in which repetition is not allowed. Also find number of four-digit numbers in which at least one digit is repeated.

The number of four digit telephone numbers having at least one of their digits repeated is: (Note: 0 can be accepted in first place)

The number of 3 digit numbers using 1, 2, 3, 4, 5 if no digit is to be used more than once in each number is.

The number of 5- digit telephone number having at least one of their digits repeated is :

The number of four digits telephone numbers having atleast one of their digit is repeated