What two numbers add up to 4520?

There are infinite combinations of two numbers that add up to 4520. Here are some examples using negative numbers:

-1 + 4521 = 4520
-2 + 4522 = 4520
-3 + 4523 = 4520
...

Here are some examples using two fractions that will add up to 4520:

4520/2 + 4520/2 = 4520
9040/3 + 4520/3 = 4520
13560/4 + 4520/4 = 4520
...

And here are some examples using two decimal numbers that will add up to 4520:

1.25 + 4518.75 = 4520
2.50 + 4517.5 = 4520
3.75 + 4516.25 = 4520
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 4520?", 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 4520. (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 4520?" has 2260 answers:

1 + 4519 = 4520
2 + 4518 = 4520
3 + 4517 = 4520
.
.
2258 + 2262 = 4520
2259 + 2261 = 4520
2260 + 2260 = 4520

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 4520 by 2 and then rounded down to the nearest whole number if necessary.

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What two numbers add up to 4521?
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