What two numbers add up to 7777?

There are infinite combinations of two numbers that add up to 7777. Here are some examples using negative numbers:

-1 + 7778 = 7777
-2 + 7779 = 7777
-3 + 7780 = 7777
...

Here are some examples using two fractions that will add up to 7777:

7777/2 + 7777/2 = 7777
15554/3 + 7777/3 = 7777
23331/4 + 7777/4 = 7777
...

And here are some examples using two decimal numbers that will add up to 7777:

1.25 + 7775.75 = 7777
2.50 + 7774.5 = 7777
3.75 + 7773.25 = 7777
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 7777?", 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 7777. (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 7777?" has 3888 answers:

1 + 7776 = 7777
2 + 7775 = 7777
3 + 7774 = 7777
.
.
3886 + 3891 = 7777
3887 + 3890 = 7777
3888 + 3889 = 7777

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 7777 by 2 and then rounded down to the nearest whole number if necessary.

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