What two numbers add up to 1260?

There are infinite combinations of two numbers that add up to 1260. Here are some examples using negative numbers:

-1 + 1261 = 1260
-2 + 1262 = 1260
-3 + 1263 = 1260
...

Here are some examples using two fractions that will add up to 1260:

1260/2 + 1260/2 = 1260
2520/3 + 1260/3 = 1260
3780/4 + 1260/4 = 1260
...

And here are some examples using two decimal numbers that will add up to 1260:

1.25 + 1258.75 = 1260
2.50 + 1257.5 = 1260
3.75 + 1256.25 = 1260
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 1260?", 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 1260. (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 1260?" has 630 answers:

1 + 1259 = 1260
2 + 1258 = 1260
3 + 1257 = 1260
.
.
628 + 632 = 1260
629 + 631 = 1260
630 + 630 = 1260

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 1260 by 2 and then rounded down to the nearest whole number if necessary.

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What two numbers add up to 1261?
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