Question

If C = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} and D = {numbers divisible by 3 from 1 to 21}, what is C ∩ D?

{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 18, 21}

{3, 6, 9, 12, 15, 18, 21}

{3, 6, 9}

{ }

Answer 1

I think it would help if you listed the numbers in set D

Answer 2

Basically, D={3,6,9,12,15,18,21}
You need to find numbers that are in set A AND set D to get C ∩ D

Answer 3

Uhh...?

Answer 4

Do you understand the part about getting the numbers in set D?

Answer 5

No

Answer 6

btw, I meant sets C and D.

Answer 7

Numbers divisible by 3 from 1-21? 3 is divisible by 3 because it equals a whole number(1). 6/3=2 (Also a whole number). 9/3=3... etc. Better?

Answer 8

Yah i understand how to do that but i dont understand how to get the answer :/ Could u walk me throug it

Answer 9

Sure. Do we agree that D={3,6,9,12,15,18,21}?

Answer 10

Yes

Answer 11

∩ means intersection which also means that the numbers in that set MUST be in the 2 sets surrounding it.

Answer 12

It basically means that the numbers in the intersection of the sets must be in BOTH sets.

Answer 13

So if A={2,4,6,7} and B={3,4,5,6}, A∩B would be {4,6} because 4 and 6 are in both sets A and B

Answer 14

Oh ok

Answer 15

Now that you have both sets, match 'em up and see which numbers are in both.
C = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
D={3,6,9,12,15,18,21}

Answer 16

3,6,9

Answer 17

Ohh Ty ^^ Can u help me with another on? please?

Answer 18

Right. Which means that your answer should look like:
A∩B={3,6,9}

Answer 19

Sure.

Answer 20

If A = {vowels in the English alphabet} and B = {consonants in the English alphabet}, what is A B?

{all letters in the English alphabet}

{a, e, i, o, u}

{b, c, d, f, g, h, j, k, l, m, n, p, q, r, s, t, v, w, x, y, z}

{ }

Answer 21

List both sets A and B, please. Also, I don't know what the relation between A and B is because you don't have anything in between A and B

Answer 22

there is supossed to be a " U" smble between the A and b on the last sentence and it stated A and B

Answer 23

That's easy, then.The answer is just all the letters of the alphabet. Consonants+vowels=letters of the alphabet.

Answer 24

O.o wow didnet think about that lol Thanks

Answer 25

Ill be posting a few more u acn help if u want

Answer 26

This would be a lot easier if OpenStudy made a Apple Application so I could write everything out...

Answer 27

They have a draw thingy

Answer 28

doesn't help. Have you tried it? My drawings always look atrocious.

Answer 29

lol ssame do u kno how to to dthis?
If A = {0, 1, 2, 3} and B = {…−3, −2, −1}, what is A ∩ B?

{…−3, −2, −1, 0, 1, 2, 3, …}

{…−3, −2, −1}

{0, 1, 2, 3}

{ }

Answer 30

{}. Empty set.

Answer 31

It can also be
Not a circle, btw

Answer 32

Ok ty and haha kinda looks like one ;)