Question: If A = {1, {a, {}}, {b}} then which item is not an element of the powerset of A a) {{b}} b) {1,{b}} c) {a,{}}

If A = {1, {a, {}}, {b}} then which item is not an element of the powerset of A

a) {{b}}

b) {1,{b}}

c) {a,{}}

d) {}

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