What two numbers add up to 3905?

There are infinite combinations of two numbers that add up to 3905. Here are some examples using negative numbers:

-1 + 3906 = 3905
-2 + 3907 = 3905
-3 + 3908 = 3905
...

Here are some examples using two fractions that will add up to 3905:

3905/2 + 3905/2 = 3905
7810/3 + 3905/3 = 3905
11715/4 + 3905/4 = 3905
...

And here are some examples using two decimal numbers that will add up to 3905:

1.25 + 3903.75 = 3905
2.50 + 3902.5 = 3905
3.75 + 3901.25 = 3905
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 3905?", 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 3905. (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 3905?" has 1952 answers:

1 + 3904 = 3905
2 + 3903 = 3905
3 + 3902 = 3905
.
.
1950 + 1955 = 3905
1951 + 1954 = 3905
1952 + 1953 = 3905

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 3905 by 2 and then rounded down to the nearest whole number if necessary.

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