What two numbers add up to 3921?

There are infinite combinations of two numbers that add up to 3921. Here are some examples using negative numbers:

-1 + 3922 = 3921
-2 + 3923 = 3921
-3 + 3924 = 3921
...

Here are some examples using two fractions that will add up to 3921:

3921/2 + 3921/2 = 3921
7842/3 + 3921/3 = 3921
11763/4 + 3921/4 = 3921
...

And here are some examples using two decimal numbers that will add up to 3921:

1.25 + 3919.75 = 3921
2.50 + 3918.5 = 3921
3.75 + 3917.25 = 3921
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 3921?", 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 3921. (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 3921?" has 1960 answers:

1 + 3920 = 3921
2 + 3919 = 3921
3 + 3918 = 3921
.
.
1958 + 1963 = 3921
1959 + 1962 = 3921
1960 + 1961 = 3921

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 3921 by 2 and then rounded down to the nearest whole number if necessary.

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