The number of 10 digit number that can be written by using the digits 2 and 3 is

The number of 10 digit numbers that can be written by using the digits 2 and 3 is

How many 10-digit numbers can be written by using the digits 1 and 2?

The number of 5 digit numbers that can be made using the digits 1 and 2 and in which at least one digit is different, is

Find the number of four digited number that can be formed using the digits 1,2, and 3.

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 ?