Question

Can someone PLEASE Help me understand what it's asking!

http://prntscr.com/17bmwk

Answer 1

What is the ~ mark?

Answer 2

and the upside down U?

Answer 3

i thought ~ was a negating symbol.

Answer 4

Does anyone have any pointers on how to solve this?

Answer 5

Yes, if you tell me what the upside down U means, lol

Answer 6

Oh, okay that means intersection of the two sets.

Answer 7

It's intercetion right? It means like, if I had set A and B.

A = [1 , 4] and B: [1, 7], the intercetion would be

Answer 8

1

Answer 9

yes :)

Answer 10

is it (~J) intersection S or ~(J intersection S) ?

Answer 11

So first you look at (~ J intersecting S) you take out ALL parts that have J in them because on the elft hand side, we have " ~ J" so we disregard the 21, the 84 AND 232

Answer 12

then we look at union "U" of that first part and B

Answer 13

So ~J Intersection S, means I take all the parts in J that are in S?

Answer 14

Oh, so I take only parts J and S have in them?

Answer 15

we disregard the 52 and 21 because we don't want to include J in our answer.We add 196 + 41 + 133

Answer 16

~J means negating J, means that you DO NOT want to include J in your answer.So wherevr J is, take that out.

Answer 17

And a union means, whatever is in J and S we leave in?

Answer 18

union means whatever is left in the area where J hasn't touched

Answer 19

the set ((~J) AND S) contains 41+133 elements.
Then you add the other 196+52 points of B that you did not count yet.

Answer 20

i liikee stats

Answer 21

So 44 and 133

Answer 22

Reemmii you're not going to add in 52 because that's a part of J that we do not want to include.

Answer 23

i forgot 21, but you have to count 52.

Answer 24

So (~J Union S)

Everything outside of J, and only the things that are in both sets of J and S? Huh, that doesn't make sense.

Answer 25

I get the !J, but the union of S confused me.

Answer 26

first: (~J) inter S:

Answer 27

What does intercept S mean?

Answer 28

NOT J intersecting S

Answer 29

Wouldn't it be, everything outside of J, and only things that are in both S and B, which is just 41.

Answer 30

then , the union wiht B means, you have to count the points all points of B (without counting twice the ones that are already part of B), so you add 196, 21 and 52.

Answer 31

the answer will be 443.

Answer 32

YES 41, 133 and 194

Answer 33

i don't understand why you're adding 52 when you don't want to include J???

Answer 34

Wait, waahhttt. I'm still on J~ Inter S.

What the does Inter S mean?

Answer 35

@jim_thompson5910 please come in here :(

Answer 36

This is what I'm using http://www.purplemath.com/modules/venndiag2.htm

Answer 37

If someone could just explain the first part to me.. yeah.. that'll be great.

Answer 38

there's a little annoying thing with the image in the question, we don't see clearly if it is (~J)inter S or ~(J inter S). I'm pretty sure it's the first one, otherwise the answer is not in the proposed values.

Answer 39

(~J) is all that's not in J: