How many four –digit numbers can be formed with the digits 3,5,7,8,9 which are greater than 7000, if repetition digits is not allowed?

Explanation

To solve the problem of how many four-digit numbers can be formed with the digits 3, 5, 7, 8, and 9 that are greater than 7000 without repetition of digits, we can follow these steps:

### Step 1: Determine the possible first digits
Since the four-digit number must be greater than 7000, the first digit must be either 7, 8, or 9. Thus, we have 3 choices for the first digit.

**Choices for the first digit:**
- 7
- 8
...