Question: E Homework: Section 2.5 Homework Question 11, 10.5.49 If a given set has 21 elements, how many of its subsets have at most two elements?

E Homework: Section 2.5 Homework Question 11, 10.5.49 If a given set has 21 elements, how many of its subsets have at most two elements? There are | subsets that have at most two elements

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