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Infinitely many.

Start with additions:

1 + 12, 2 + 11, etc

Then look at numbers with one decimal point:

0.1 + 12.9, 0.2 + 12.8, etc

and then 2 decimal places, 3 dp, 4 dp and so on.

Next, look at combinations of three number, four numbers etc.

And that is only addition. Addition combined with subtraction offers a lot more possibilities.

And then there are multiplication, division, exponentiation and so on.

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Q: How many number combinations equal 13?
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How many 13 number combinations in 40 numbers?

There are 12,033,222,880 of them.


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There is only one possible combination of a 13 digit number created from 13 digits. In a combination, the order of the digits does not matter so that 123 is the same as 132 or 312 etc. If there are 13 different digits (characters) there is 1 combination of 13 digits 13 combinations of 1 or of 12 digits 78 combinations of 2 or of 11 digits and so on There are 213 - 1 = 8191 in all. If the characters are not all different it is necessary to have more information.


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