Question

Find A union B.
A: {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}
B: {−2, −1, 1, 4, 7, 11}
Answers:
{−2, −1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}

{1, 4, 7, 11}

{−2, −1, 1, 4, 7, 11}

{ }

Answer 1

@ryan123345 ? help

Answer 2

i really don't know union , i attempted intersection.

Answer 3

A U B means all the elements of both set A and B.

Answer 4

Where same terms will only be written once.

Answer 5

@saifoo.khan so the first one?

Answer 6

and intersection will mean what?

Answer 7

Yes.

Intersection means the common terms of set A and B.
So if they asked you A intersection B then you answer would've been option B.

Answer 8

thank you one more thing. so this question

Answer 9

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

Answer 10

am i correct?

Answer 11

Nope. What you answered is the insection.

Answer 12

intersection*

Answer 13

So its {−3, −1, 3, 4, 6, 9, 11, 12, 15} ? I think.?

Answer 14

Great.

Answer 15

@saifoo.khan thanks