How many four-digit numbers can be formed by using the digits 1, 2, 3, 4, 5, 6, 7 if at least one digit is repeated.

How many numbers of 4-digits can be formed by using the digits 1,2,3,4,5,6,7, if at least one digit is repeated?

How many four digit numbers can be formed using digits 1, 2, 3, 4, 5 such that at least one of the number is respeated?

How many four digit numbers can be formed using digits 1, 2, 3, 4, 5 such that at least one of the number is respeated?

How many three-digit numbers can be formed using the digits 2, 3, 4, 5, 6 if digits can be repeated?

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.

How many four digit numbers can be formed using digits 1,2,3,4,5 such that atleast one of the number is repeated?

How many 4 digit numbers can be formed using the digits 9, 8, 7, 6, 5, 4, if no digits are repeated?

Find the number of 4 - digit numbers that can be formed by using the digits 1, 2, 3, 4, 5 if no digit is repeated. How many of these will be even ?