What two numbers add up to 6402?

There are infinite combinations of two numbers that add up to 6402. Here are some examples using negative numbers:

-1 + 6403 = 6402
-2 + 6404 = 6402
-3 + 6405 = 6402
...

Here are some examples using two fractions that will add up to 6402:

6402/2 + 6402/2 = 6402
12804/3 + 6402/3 = 6402
19206/4 + 6402/4 = 6402
...

And here are some examples using two decimal numbers that will add up to 6402:

1.25 + 6400.75 = 6402
2.50 + 6399.5 = 6402
3.75 + 6398.25 = 6402
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 6402?", 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 6402. (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 6402?" has 3201 answers:

1 + 6401 = 6402
2 + 6400 = 6402
3 + 6399 = 6402
.
.
3199 + 3203 = 6402
3200 + 3202 = 6402
3201 + 3201 = 6402

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 6402 by 2 and then rounded down to the nearest whole number if necessary.

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What two numbers add up to 6403?
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