How many 10-digit number can be formed using 0 , 1 , 2, 3 , ………. 8 , 9 without repetition?

Explanation

To find how many 10-digit numbers can be formed using the digits from 0 to 9 without repetition, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Problem**:
We need to form a 10-digit number using the digits 0 to 9. Since we are forming a 10-digit number, the first digit cannot be 0 (as it would not be a valid 10-digit number).

2. **Choosing the First Digit**:
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