All the possible subset of {a,b} are:

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18 + 1 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.

All the possible subset of {a,b} are:

∅ {a} ,{b},{a,b}

∅,{a} {b} ,{a,b}

∅ {a,b}

∅