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OpenStudy (anonymous):
Let A = {1,2,3,...,20}. How many ways can we partition A into two subsets of equal size?
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jimthompson5910 (jim_thompson5910):
This is the same as calculating 20 C 10 (the combination formula)
jimthompson5910 (jim_thompson5910):
Because you have 20 choices and 10 slots to place those choices.
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