What two numbers add up to 9877?

There are infinite combinations of two numbers that add up to 9877. Here are some examples using negative numbers:

-1 + 9878 = 9877
-2 + 9879 = 9877
-3 + 9880 = 9877
...

Here are some examples using two fractions that will add up to 9877:

9877/2 + 9877/2 = 9877
19754/3 + 9877/3 = 9877
29631/4 + 9877/4 = 9877
...

And here are some examples using two decimal numbers that will add up to 9877:

1.25 + 9875.75 = 9877
2.50 + 9874.5 = 9877
3.75 + 9873.25 = 9877
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 9877?", 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 9877. (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 9877?" has 4938 answers:

1 + 9876 = 9877
2 + 9875 = 9877
3 + 9874 = 9877
.
.
4936 + 4941 = 9877
4937 + 4940 = 9877
4938 + 4939 = 9877

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 9877 by 2 and then rounded down to the nearest whole number if necessary.

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