What two numbers add up to 2639?

There are infinite combinations of two numbers that add up to 2639. Here are some examples using negative numbers:

-1 + 2640 = 2639
-2 + 2641 = 2639
-3 + 2642 = 2639
...

Here are some examples using two fractions that will add up to 2639:

2639/2 + 2639/2 = 2639
5278/3 + 2639/3 = 2639
7917/4 + 2639/4 = 2639
...

And here are some examples using two decimal numbers that will add up to 2639:

1.25 + 2637.75 = 2639
2.50 + 2636.5 = 2639
3.75 + 2635.25 = 2639
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 2639?", 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 2639. (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 2639?" has 1319 answers:

1 + 2638 = 2639
2 + 2637 = 2639
3 + 2636 = 2639
.
.
1317 + 1322 = 2639
1318 + 1321 = 2639
1319 + 1320 = 2639

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 2639 by 2 and then rounded down to the nearest whole number if necessary.

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