How many 3-digit numbers can be formed with the digits 1,2,3,4,5 such that each digit can be used any number of times
How many number of four digits can be formed with the digits 1,2,3,4,5 if the digit can be repeated in any number of times?
How many three digit numbers can be formed by using the digits 0, 1, 3, 5, 7 while each digit may be repeated any number of times ?