What two numbers add up to 9878?

There are infinite combinations of two numbers that add up to 9878. Here are some examples using negative numbers:

-1 + 9879 = 9878
-2 + 9880 = 9878
-3 + 9881 = 9878
...

Here are some examples using two fractions that will add up to 9878:

9878/2 + 9878/2 = 9878
19756/3 + 9878/3 = 9878
29634/4 + 9878/4 = 9878
...

And here are some examples using two decimal numbers that will add up to 9878:

1.25 + 9876.75 = 9878
2.50 + 9875.5 = 9878
3.75 + 9874.25 = 9878
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 9878?", 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 9878. (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 9878?" has 4939 answers:

1 + 9877 = 9878
2 + 9876 = 9878
3 + 9875 = 9878
.
.
4937 + 4941 = 9878
4938 + 4940 = 9878
4939 + 4939 = 9878

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 9878 by 2 and then rounded down to the nearest whole number if necessary.

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