What two numbers add up to 6378?

There are infinite combinations of two numbers that add up to 6378. Here are some examples using negative numbers:

-1 + 6379 = 6378
-2 + 6380 = 6378
-3 + 6381 = 6378
...

Here are some examples using two fractions that will add up to 6378:

6378/2 + 6378/2 = 6378
12756/3 + 6378/3 = 6378
19134/4 + 6378/4 = 6378
...

And here are some examples using two decimal numbers that will add up to 6378:

1.25 + 6376.75 = 6378
2.50 + 6375.5 = 6378
3.75 + 6374.25 = 6378
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 6378?", 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 6378. (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 6378?" has 3189 answers:

1 + 6377 = 6378
2 + 6376 = 6378
3 + 6375 = 6378
.
.
3187 + 3191 = 6378
3188 + 3190 = 6378
3189 + 3189 = 6378

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 6378 by 2 and then rounded down to the nearest whole number if necessary.

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