Question

Maximum sum form list of integers but no digit repetition is allowed

Answer 1

Answer:

Explanation:

The last 10-digit number must be 9,999,999,999. The first 999,999,999 numbers are only 9-digit or less, so if you subtract 9,999,999,999 - 999,999,999 that leaves 9,000,000,000 or 90 billion numbers with exactly 10 digits.

Answer 2

Explanation:

The formula for sum of all numbers formed with all the given digits is: (Sum of digits) (n-1)!(1111....ntimes) n stands for number of digits.