Question

Find A ∩ B if A = {4, 7, 10, 13, 17} and B = {3, 5, 7, 9}.


Ø
{7}
{3, 4, 5, 7, 9, 10, 13, 17}

Answer 1

In what ways are the two sets the same.... which is a way of asking for intersection.

Answer 2

What values do the sets share in common?

Answer 3

7, so that's my answer. Could you tell what the symbol in between the A and B means?

Answer 4

It is the logic symbol for intersection.

Answer 5

Oh, okay. That makes sense.

Answer 6

If it looks like a U... it would mean union (which is like adding two sets together).

Answer 7

Okay, what if it's sideways, open towards the right?

Answer 8

That means "belongs to"

Answer 9

Or subset of.

Answer 10

Okay, would you mind helping me with another problem?

Answer 11

Sure, go ahead.

Answer 12

If A = {4, 7, 10, 13, 17} and B = {3, 5, 7, 9}, then which of the following statements is false?


Ø A
B B
B A
The first answer has the "belongs to" symbol, the second has the "belongs to" symbol with a line under it(which I think means equal to), and the third has "belongs to" symbol also.

Answer 13

So, the empty is a member of EVERY set. No matter what.
Every set is a subset of of itself.
The third question can be answered by considering the members of B and whether they are also in A. Does the member 3 in B also exist in A?

Answer 14

*empty = empty set.

Answer 15

Yes, that would be 7.

Answer 16

Or do you mean the number itself 3?

Answer 17

Yes, remember that subset means that every member of B is going to be in A.

Answer 18

So, the member 3 is in B but it is not in A. So B is not a subset of A. So, it is a false statement.

Answer 19

Okay, that makes much more sense now. Thank you!!!

Answer 20

You bet. Gotta head to work. Have a great morning.