Find the sum of all natural between 250 and 1000 which are exactly divisible by 3.

Explanation

To find the sum of all natural numbers between 250 and 1000 that are exactly divisible by 3, we can follow these steps:

### Step 1: Identify the first and last terms
- The first natural number greater than 250 that is divisible by 3 is 252.
- The last natural number less than 1000 that is divisible by 3 is 999.

### Step 2: Establish the sequence
- The sequence of natural numbers between 252 and 999 that are divisible by 3 is:
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