What two numbers add up to 3580?

There are infinite combinations of two numbers that add up to 3580. Here are some examples using negative numbers:

-1 + 3581 = 3580
-2 + 3582 = 3580
-3 + 3583 = 3580
...

Here are some examples using two fractions that will add up to 3580:

3580/2 + 3580/2 = 3580
7160/3 + 3580/3 = 3580
10740/4 + 3580/4 = 3580
...

And here are some examples using two decimal numbers that will add up to 3580:

1.25 + 3578.75 = 3580
2.50 + 3577.5 = 3580
3.75 + 3576.25 = 3580
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 3580?", 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 3580. (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 3580?" has 1790 answers:

1 + 3579 = 3580
2 + 3578 = 3580
3 + 3577 = 3580
.
.
1788 + 1792 = 3580
1789 + 1791 = 3580
1790 + 1790 = 3580

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 3580 by 2 and then rounded down to the nearest whole number if necessary.

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