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Thank you-- 2 to the power of 17 minus one is the answer I was looking for.
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Thank you-- 2 to the power of 17 minus one is the answer I was looking for.

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I have 17 items:<br />
ABCDEFGHIJKLMNOPQ<br />
I am working on a project that combines PDF documents in order, and I need to know how many total options would be possible.<br />
<br />
There can be any combination of them, providing each item can only appear in the list once and the results are always in alphabetical order.<br />
<br />
For example these would all be valid, <br />
ACB<br />
ACE<br />
BFJ<br />
<br />
But these would not be valid:<br />
BBB<br />
BCA<br />
<br />
How can the number of options be calculated?
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I have 17 items:
ABCDEFGHIJKLMNOPQ
I am working on a project that combines PDF documents in order, and I need to know how many total options would be possible.

There can be any combination of them, providing each item can only appear in the list once and the results are always in alphabetical order.

For example these would all be valid, 
ACB
ACE
BFJ

But these would not be valid:
BBB
BCA

How can the number of options be calculated?

Math: Number of possible combinations when sorted alphabetically

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