If 4-digits numbers greater than or equal to 5000 are randomly formed form the digits 0, 1, 3, 5 and 7 what is the probability of forming number divisible by 5 when i. the digits may be repeated.

Explanation

To solve the problem of finding the probability of forming a 4-digit number greater than or equal to 5000 that is divisible by 5, using the digits 0, 1, 3, 5, and 7, we will follow these steps:

### Step 1: Determine the Total Number of Cases
1. **Identify the first digit**: Since the number must be greater than or equal to 5000, the first digit can only be 5 or 7. Thus, there are 2 options for the first digit.
2. **Fill the remaining digits**: The second, third, and fourth digits can be any of the 5 digits (0, 1, 3, 5, 7) since repetition is allowed.
- Second digit: 5 options
- Third digit: 5 options
- Fourth digit: 5 options
...