probability interview question choose two random subsets one is another

probability interview question choose two random subsets one is another

Suppose we choose two random subsets A, B of {1,2,...,n} independently and uniformly at random. What is the probability that A ⊆ B

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Probability interview questions:

https://www.youtube.com/watch?v=qphhG_1rWf8&list=PLg9w7tItBlZtI1eM6znSYfyDEaqQtUx5b