If A = {1, 3} and B = {1, 2, 3}, then A U B = ___________:

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9 + 10 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.

If A = {1, 3} and B = {1, 2, 3}, then A U B = ___________:

{1}

{}

{1, 3}

{1, 2, 3}