Find the number of different telephone numbers formed by taking 6 digits from `1,2,3,4,5,6,7`

Find the number of 4 - digit telephone numbers that can be formed using the digits 1,2,3,4,5,6 with atleast one digit repeated.

The number of three digited telephone numbers than can be formed using the digits 1,2,3,4,5,6 with atleast one digit repeated is

Find the number of three-digit numbers formed by using digits 1,2,3,4,6,7,8,9 without repetition such that sum of digits of the numbers formed is even.

Find the number of three-digit numbers formed by using digits 1,2,3,4,6,7,8,9 without repetition such that sum of digits of the numbers formed is even.

Find the number of three-digit numbers formed by using digits 1,2,3,4,6,7,8,9 without repetition such that sum of digits of the numbers formed is even.

Find the number of distinct numbers formed using the digits 3, 4, 5, 6, 7, 8, 9, so that odd positions are occupied by odd digits.

Find the number of permutations of 4-digit numbers that can be formed using the digits 1,2,3,4,5,6 when repetition is alowed.

Find the number of 4 - digit numbers that can be formed using the digits 1,2,5,6, 7. How many of them are divisible by i) 2 ii) 3 iii)4 iv) 5 v) 25.