What two numbers add up to 843?

There are infinite combinations of two numbers that add up to 843. Here are some examples using negative numbers:

-1 + 844 = 843
-2 + 845 = 843
-3 + 846 = 843
...

Here are some examples using two fractions that will add up to 843:

843/2 + 843/2 = 843
1686/3 + 843/3 = 843
2529/4 + 843/4 = 843
...

And here are some examples using two decimal numbers that will add up to 843:

1.25 + 841.75 = 843
2.50 + 840.5 = 843
3.75 + 839.25 = 843
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 843?", 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 843. (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 843?" has 421 answers:

1 + 842 = 843
2 + 841 = 843
3 + 840 = 843
.
.
419 + 424 = 843
420 + 423 = 843
421 + 422 = 843

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

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