What two numbers add up to 6401?

There are infinite combinations of two numbers that add up to 6401. Here are some examples using negative numbers:

-1 + 6402 = 6401
-2 + 6403 = 6401
-3 + 6404 = 6401
...

Here are some examples using two fractions that will add up to 6401:

6401/2 + 6401/2 = 6401
12802/3 + 6401/3 = 6401
19203/4 + 6401/4 = 6401
...

And here are some examples using two decimal numbers that will add up to 6401:

1.25 + 6399.75 = 6401
2.50 + 6398.5 = 6401
3.75 + 6397.25 = 6401
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 6401?", 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 6401. (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 6401?" has 3200 answers:

1 + 6400 = 6401
2 + 6399 = 6401
3 + 6398 = 6401
.
.
3198 + 3203 = 6401
3199 + 3202 = 6401
3200 + 3201 = 6401

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 6401 by 2 and then rounded down to the nearest whole number if necessary.

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