What two numbers add up to 8425?

There are infinite combinations of two numbers that add up to 8425. Here are some examples using negative numbers:

-1 + 8426 = 8425
-2 + 8427 = 8425
-3 + 8428 = 8425
...

Here are some examples using two fractions that will add up to 8425:

8425/2 + 8425/2 = 8425
16850/3 + 8425/3 = 8425
25275/4 + 8425/4 = 8425
...

And here are some examples using two decimal numbers that will add up to 8425:

1.25 + 8423.75 = 8425
2.50 + 8422.5 = 8425
3.75 + 8421.25 = 8425
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 8425?", 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 8425. (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 8425?" has 4212 answers:

1 + 8424 = 8425
2 + 8423 = 8425
3 + 8422 = 8425
.
.
4210 + 4215 = 8425
4211 + 4214 = 8425
4212 + 4213 = 8425

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 8425 by 2 and then rounded down to the nearest whole number if necessary.

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