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OpenStudy (anonymous):
Assume that the set S has 13 elements. How many subsets of S have at most 3 elements?
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OpenStudy (anonymous):
Nice one. All the sets that have 1, plus all the sets that have 2, plus all the sets that have 3.
jimthompson5910 (jim_thompson5910):
Hint: You have 13 elements, and you have 3 slots to assign these 13 elements. The order doesn't matter
jimthompson5910 (jim_thompson5910):
This is to find the number of sets with 3 items in it. Use the same idea to find the number of sets with 2 items, 1 item and 0 items.
OpenStudy (anonymous):
Thank you!! It was 378!
jimthompson5910 (jim_thompson5910):
you are 100% correct, nice work
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OpenStudy (anonymous):
Ooh, I forgot the set containing zero items, good catch, jim!
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