Write the smallest digit and the greatest digit in the blank space of each of the followingnumbers so that the number formed is divisible by 3 :(a)                    (b)

Explanation

To solve the problem of finding the smallest and greatest digits that can be placed in the blank spaces of the given numbers so that the resulting numbers are divisible by 3, we will follow these steps:

### Part (a)

1. **Identify the Given Digits**: The number has a blank space and the digits are 6, 7, 2, and 4.

2. **Calculate the Sum of Known Digits**:
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