What two numbers add up to 7781?

There are infinite combinations of two numbers that add up to 7781. Here are some examples using negative numbers:

-1 + 7782 = 7781
-2 + 7783 = 7781
-3 + 7784 = 7781
...

Here are some examples using two fractions that will add up to 7781:

7781/2 + 7781/2 = 7781
15562/3 + 7781/3 = 7781
23343/4 + 7781/4 = 7781
...

And here are some examples using two decimal numbers that will add up to 7781:

1.25 + 7779.75 = 7781
2.50 + 7778.5 = 7781
3.75 + 7777.25 = 7781
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 7781?", 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 7781. (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 7781?" has 3890 answers:

1 + 7780 = 7781
2 + 7779 = 7781
3 + 7778 = 7781
.
.
3888 + 3893 = 7781
3889 + 3892 = 7781
3890 + 3891 = 7781

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 7781 by 2 and then rounded down to the nearest whole number if necessary.

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