SOLUTION: How many different groups of students can show up for a seminar with an enrollment of 13​?

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Question 1124335: How many different groups of students can show up for a seminar with an enrollment of 13​?
Found 2 solutions by addingup, ikleyn:
Answer by addingup(3677) About Me  (Show Source):
You can put this solution on YOUR website!
How many in a group? Please add this info.

Answer by ikleyn(52787) About Me  (Show Source):
You can put this solution on YOUR website!
.
The number of different subsets of the set of 13 elements is equal to  2%5E13,  including the empty subset.


If to consider only nonempty subsets, then the answer to the problem's question is  2%5E13-1.

Solved.