The power set of a power set

ComputeCounting functions and subsetsSet operations and set equality

How many elements does $\mathcal{P}(\mathcal{P}(\{1, 2\}))$ have? (Here $\mathcal{P}(S)$ is the power set of $S$ .)

Enter an exact value or a decimal.

The power set of a power set · Proofwise

ComputeCounting functions and subsetsSet operations and set equality

How many elements does $\mathcal{P}(\mathcal{P}(\{1, 2\}))$ have? (Here $\mathcal{P}(S)$ is the power set of $S$ .)

Enter an exact value or a decimal.