What two numbers add up to 7801?

There are infinite combinations of two numbers that add up to 7801. Here are some examples using negative numbers:

-1 + 7802 = 7801
-2 + 7803 = 7801
-3 + 7804 = 7801
...

Here are some examples using two fractions that will add up to 7801:

7801/2 + 7801/2 = 7801
15602/3 + 7801/3 = 7801
23403/4 + 7801/4 = 7801
...

And here are some examples using two decimal numbers that will add up to 7801:

1.25 + 7799.75 = 7801
2.50 + 7798.5 = 7801
3.75 + 7797.25 = 7801
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 7801?", 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 7801. (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 7801?" has 3900 answers:

1 + 7800 = 7801
2 + 7799 = 7801
3 + 7798 = 7801
.
.
3898 + 3903 = 7801
3899 + 3902 = 7801
3900 + 3901 = 7801

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 7801 by 2 and then rounded down to the nearest whole number if necessary.

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