How many 10-digit number can be formed using 0 , 1 , 2, 3 , ………. 8 , 9 without repetition and what is the sum of all such members ?

Explanation

To solve the problem of how many 10-digit numbers can be formed using the digits 0 to 9 without repetition, and to find the sum of all such numbers, we can break down the solution into clear steps.

### Step 1: Count the Total Number of 10-Digit Numbers

1. **Understanding the 10-Digit Number Requirement**: A 10-digit number cannot start with 0. Therefore, the first digit must be one of the digits from 1 to 9.

2. **Choosing the First Digit**: There are 9 choices for the first digit (1 to 9).

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