If A = {1, 2, 3, ________} and B = {0, 1, 2, 3} then A U B will be:

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

If A = {1, 2, 3, ________} and B = {0, 1, 2, 3} then A U B will be:

{0, 1, 3, 5 ____}

{1, 2, 3, 1, ____.}

{±1, ±2,±3, ____ }

{0, 1, 2, 3, ____.}