2000.
The smallest four-digit number there can be is 1000. So, add 1000 and 1000 to get 2000, then least sum you can get when adding two four-digit numbers.
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No, it is not. Those are just a random group of numbers. A sum is an amount resulting from the adding of at least two numbers.
The result of adding two numbers is their sum.
When adding numbers, the total is the sum. The sum of two odd numbers is even.
sum
A sum.