A five-digit number is formed using digits 1,3,5,8 and 9 without repeating any one of them.
What is the sum of all such possible numbers?
The combination of the 5 digits without repeating anyone, can be calculated as follows:
1 x 2 x3 x 4x 5 = 120 combinations.
The sum of the 5 digits is 1+3+5+8+9 = 26
Then, the total sum is 120 x 26 = 3120