Suppose X is a set of size n. How many pairs of sets (A,B) exist such – McqOptions

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1.	Suppose X is a set of size n. How many pairs of sets (A,B) exist such that, A ⊆ B ⊆ X .
A.	2n +1
B.	22n
C.	3n
D.	3n+1
Answer» D. 3n+1

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