What two numbers add up to 3500?

There are infinite combinations of two numbers that add up to 3500. Here are some examples using negative numbers:

-1 + 3501 = 3500
-2 + 3502 = 3500
-3 + 3503 = 3500
...

Here are some examples using two fractions that will add up to 3500:

3500/2 + 3500/2 = 3500
7000/3 + 3500/3 = 3500
10500/4 + 3500/4 = 3500
...

And here are some examples using two decimal numbers that will add up to 3500:

1.25 + 3498.75 = 3500
2.50 + 3497.5 = 3500
3.75 + 3496.25 = 3500
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 3500?", it may be more interesting to set some criteria to limit the result. We will set the follow criteria:

1) Only positive whole numbers can add up to 3500. (0 is not a positive or negative number and should not be included.)

2) Since a+b=29 is the same as b+a=29, we should only list it once.

Now, the answer to "What two numbers add up to 3500?" has 1750 answers:

1 + 3499 = 3500
2 + 3498 = 3500
3 + 3497 = 3500
.
.
1748 + 1752 = 3500
1749 + 1751 = 3500
1750 + 1750 = 3500

We have truncated the list above due to space, but you may be interested to know that we calculated the number of answers by dividing 3500 by 2 and then rounded down to the nearest whole number if necessary.

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