Here's something I know there must be a way to easily figure out... but not by me!(adsbygoogle = window.adsbygoogle || []).push({});

THE QUESTION...

if I have x number of categories to choose from, how many combinations can I get?

for example I think that if I had 4 categories there are 15 possible combinations

categories A, B, C, D

combinations:

A

B

C

D

AB

AC

AD

ABC

ABCD

BC

BCD

CD

ACD

ABD

BD

Am I missing any?

so if 4 yeilds 15

5 yields ?

6 yields ?

I'm know a pattern develops but how does it work? Sorry I've been out of school for so long and I don't know where to begin.

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# Multiple properties and property combinations

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