What two numbers add up to 8490?

There are infinite combinations of two numbers that add up to 8490. Here are some examples using negative numbers:

-1 + 8491 = 8490
-2 + 8492 = 8490
-3 + 8493 = 8490
...

Here are some examples using two fractions that will add up to 8490:

8490/2 + 8490/2 = 8490
16980/3 + 8490/3 = 8490
25470/4 + 8490/4 = 8490
...

And here are some examples using two decimal numbers that will add up to 8490:

1.25 + 8488.75 = 8490
2.50 + 8487.5 = 8490
3.75 + 8486.25 = 8490
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 8490?", 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 8490. (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 8490?" has 4245 answers:

1 + 8489 = 8490
2 + 8488 = 8490
3 + 8487 = 8490
.
.
4243 + 4247 = 8490
4244 + 4246 = 8490
4245 + 4245 = 8490

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 8490 by 2 and then rounded down to the nearest whole number if necessary.

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