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6 items
how many different selections can be made
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None --> 1
1 --> 6
2 --> 6*5/2 (assuming AB is the same as BA) = 15
3 --> 6*5*4/(3*2*1) = 20
4 --> 6*5*4*3/(4*3*2*1) = 15
5 --> 6
6 --> 1
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--> 64 total
(= 2^6)
