What two numbers add up to 3961?

There are infinite combinations of two numbers that add up to 3961. Here are some examples using negative numbers:

-1 + 3962 = 3961
-2 + 3963 = 3961
-3 + 3964 = 3961
...

Here are some examples using two fractions that will add up to 3961:

3961/2 + 3961/2 = 3961
7922/3 + 3961/3 = 3961
11883/4 + 3961/4 = 3961
...

And here are some examples using two decimal numbers that will add up to 3961:

1.25 + 3959.75 = 3961
2.50 + 3958.5 = 3961
3.75 + 3957.25 = 3961
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 3961?", 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 3961. (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 3961?" has 1980 answers:

1 + 3960 = 3961
2 + 3959 = 3961
3 + 3958 = 3961
.
.
1978 + 1983 = 3961
1979 + 1982 = 3961
1980 + 1981 = 3961

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 3961 by 2 and then rounded down to the nearest whole number if necessary.

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