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Let A be a set with 20 elements. a. Find the number of subsets of A....

Let A be a set with 20 elements.

a. Find the number of subsets of A.

b. Find the number of subsets of A having one or more elements.

c. Find the number of subsets of A having exactly one element.

d. Find the number of subsets of A having two or more elements.​ (Hint: Use the answers to parts b and​ c.)

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