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
Let S be the set of all 5 digit numbers formed by the digits 1, 2, 3, 4, 5 without repetition. What is the sum of all numbers in S?
