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

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13 + 4 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.

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

φ, {b}, {a, b}

φ, {a}

φ, {a, b}

φ, {a}, {b}, {a, b}