What two numbers add up to 3986?

There are infinite combinations of two numbers that add up to 3986. Here are some examples using negative numbers:

-1 + 3987 = 3986
-2 + 3988 = 3986
-3 + 3989 = 3986
...

Here are some examples using two fractions that will add up to 3986:

3986/2 + 3986/2 = 3986
7972/3 + 3986/3 = 3986
11958/4 + 3986/4 = 3986
...

And here are some examples using two decimal numbers that will add up to 3986:

1.25 + 3984.75 = 3986
2.50 + 3983.5 = 3986
3.75 + 3982.25 = 3986
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 3986?", 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 3986. (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 3986?" has 1993 answers:

1 + 3985 = 3986
2 + 3984 = 3986
3 + 3983 = 3986
.
.
1991 + 1995 = 3986
1992 + 1994 = 3986
1993 + 1993 = 3986

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 3986 by 2 and then rounded down to the nearest whole number if necessary.

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