Permutations

Soldato
Joined
1 Mar 2003
Posts
5,508
Location
Cotham, Bristol
So been a while since I've done anything like this. Say you have a 2 * 2 matrix where it's indices values can be 1 or 0. How many unique permutations are there?

Eg.

Code:
11
11

10
11

I started by drawing them out and got to about 13 or 14 then stopped to think if there was some formula which could work it out?
 
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