What two numbers add up to 7970?

There are infinite combinations of two numbers that add up to 7970. Here are some examples using negative numbers:

-1 + 7971 = 7970
-2 + 7972 = 7970
-3 + 7973 = 7970
...

Here are some examples using two fractions that will add up to 7970:

7970/2 + 7970/2 = 7970
15940/3 + 7970/3 = 7970
23910/4 + 7970/4 = 7970
...

And here are some examples using two decimal numbers that will add up to 7970:

1.25 + 7968.75 = 7970
2.50 + 7967.5 = 7970
3.75 + 7966.25 = 7970
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 7970?", 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 7970. (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 7970?" has 3985 answers:

1 + 7969 = 7970
2 + 7968 = 7970
3 + 7967 = 7970
.
.
3983 + 3987 = 7970
3984 + 3986 = 7970
3985 + 3985 = 7970

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 7970 by 2 and then rounded down to the nearest whole number if necessary.

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