Question

A upside down U B.
A: {2, 4, 6, 8, 10, 12}
B: {−2, −1, 2, 4, 7, 11}

{−2, −1, 2, 4, 6, 7, 8, 10, 11, 12}

{1, 4, 7, 11}

{2, 4}

{ }