If U = {1, 2, 3, 4}, A = {4}, then A^c = ?:

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9 + 7 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.

If U = {1, 2, 3, 4}, A = {4}, then A^c = ?:

ϕ

{1, 2, 3}

{1, 2, 3}

{1}