Question

Find B union D.
B: {−3, −1, 3, 4, 9, 11}
D: {numbers divisible by 3 from 1 to 15}

{3, 9}
{−3, −1, 3, 4, 9, 11}
{ }
{−3, −1, 3, 4, 6, 9, 11, 12, 15}

Answer 1

\[ B \cup D\]
will include all elements of B, so we know that a, c choices cany be right, we also know that 6 is divisible by 3, so is 15, and 12, so it cannot be B. It must be D