Question

how to find x in this graph ?!

Answer 1

are you sure the value of Universal is 500 ?

Answer 2

x=260 ?
do you have an answer sheet?

Answer 3

how to find x ?! help please @satellite73 @jim_thompson5910 @Mertsj @phi @Callisto @thomaster @wio @primeralph

Answer 4

give me a medal so that i can answer u

Answer 5

i will gave the medal any way but i need to see how to solve it first @yazed

Answer 6

it is the horizontal line on the bottom

Answer 7

give me the medal

Answer 8

so x equal to what ?!@yazed

Answer 9

x is the horizontal line

Answer 10

@yazed , stop harassing for a medal.... Can you help?

Answer 11

y is the vertical line

Answer 12

i am a math teacher

Answer 13

bro x equal to a number i need to get that number ?@yazed

Answer 14

I sincerely hope not. This is not helpful discussion.

@boyb39 What is the subject you're studying?

Answer 15

discrete mathematics subject @theEric

Answer 16

Thanks... I'm curious, so I'll take a look at that... I haven't seen that before. Sorry I don't know! I've seen some set theory, but nothing like that...

Answer 17

The total amount of elements is 500.

Answer 18

yes it is 500 @science0229

Answer 19

Is it multiple choice?

Answer 20

to make it simple

Answer 21

no it is not multiple choice @theEric

Answer 22

n(F)=285
n(H)=195
n(B)=115

Answer 23

I have to agree with RadEn's comment are you sure U=500?

Answer 24

yes @jayz657

Answer 25

Hey guys, maybe the numbers in the main 285, 195, and 115 are for the number of elements int that whole set? That isn't a good representation in a venn diagram, but I'll look at that.

Answer 26

n(F U H U B)=285+195+115-(70+45+50)=430

Answer 27

Correction: 430+3x

Answer 28

Second Correction: 285+195+115-(70+45+50)+3x

Answer 29

Cool! My suggestion was weird anyway.

Answer 30

Wait, I read the diagram wrong...
Sorry guys..

Answer 31

Yeah, I'm still not sure what's going on. Very sorry @boyb39 .

Answer 32

I know.

Answer 33

me too i good at discreet math but this question like has no solution @theEric thanks for coming btw.

Answer 34

My pleasure! What is the name of the chapter you're studying, or something?

This is a weird-looking problem.

Answer 35

I don't know what the numbers signify, actually. Cardinality of that partition of the set? Or something fancy like that?

Answer 36

I think we need to brainstorm on what "Universe" (not "Universal" means in this context. Who would care to opine what U=500 means in practical terms in this problem?

Answer 37

it was my class exercise chapter sets ,"the graph was give like that "there is no other details @theEric

Answer 38

Do you have an answer key?

Answer 39

no @science0229

Answer 40

Was there a title to this worksheet? I'm sorry that I probably won't be able to help.

Sometimes teachers use exercise sheets from other places, and might not have taught it well... I hope that's not the case.

Answer 41

not at all just this graph only ?@theEric

Answer 42

I see...

Answer 43

Do you have your answer now?

Answer 44

I think we're all unsure. Could you help?

Answer 45

@primeralph

Answer 46

@primeralph would you be able to help, or where you just looking?

Answer 47

x=0

Answer 48

science: I'd surely like to know how you got x = 0, and whether or not you can demo that this is the correct "answer."

Answer 49

http://images.search.yahoo.com/images/view;_ylt=A0PDoKopvtBSEDoAo7GJzbkF;_ylu=X3oDMTIzdDNmZnE3BHNlYwNzcgRzbGsDaW1nBG9pZAM5YTYxODgwYjQyZGZhMjA5NDljNWNkYjgxZDAwOGRjMARncG9zAzcyBGl0A2Jpbmc-?back=http%3A%2F%2Fimages.search.yahoo.com%2Fsearch%2Fimages%3Fp%3Ddiscrete%2Bmath%2Bvenn%2Bdiagram%2Bfind%2Bx%26n%3D60%26ei%3Dutf-8%26y%3DSearch%26fr%3Dmoz35%26spos%3D12%26nost%3D1%26tab%3Dorganic%26ri%3D72&w=1920&h=1080&imgurl=i1.ytimg.com%2Fvi%2FYYM_Wju0-so%2Fmaxresdefault.jpg&rurl=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DYYM_Wju0-so&size=149.5KB&name=Finite+%3Cb%3EMath%3C%2Fb%3E%3A+%3Cb%3EVenn+Diagram+%3C%2Fb%3ERegion+Method+-+YouTube&p=discrete+math+venn+diagram+find+x&oid=9a61880b42dfa20949c5cdb81d008dc0&fr2=&fr=moz35&tt=Finite+%3Cb%3EMath%3C%2Fb%3E%3A+%3Cb%3EVenn+Diagram+%3C%2Fb%3ERegion+Method+-+YouTube&b=61&ni=96&no=72&ts=&tab=organic&sigr=11asrk23c&sigb=14h0ishnf&sigi=11dbkorv0&.crumb=jnRNv99.snV&fr=moz35

Answer 50

n(F)=28

Answer 51

n(H)=195

Answer 52

n(B)=115

Answer 53

Correction: n(F)=285

Answer 54

Eh, I still don't get anything...

Answer 55

There is clearly a flaw in the problem since
Set B has 115 unique members, Set F has 285 unique members and Set H has 195 unique members. That means there are 595 unique members and the universal set has only 500 members? Can't be.

Answer 56

n(U)=285+195+115-(70+45+50)+b=500 -----> b=70

Answer 57

b is the outside elements

Answer 58

So, n(F U H U B)=430

Answer 59

@Mertsj So have you seen this before?

Answer 60

no

Answer 61

So either the problem is flawed or there is explanatory material that the asker has not included with the problem.

Answer 62

My hunch would be the second option since my experience is that is usually the case.

Answer 63

I see...

Answer 64

Could you double check all of the numbers please, @boyb39 ?

Answer 65

n(F U H U B)=595-(70+45+50-x)=430 ---------> x=0

Answer 66

And you notice that the asker has disappeared as we all agonize over his problem.

Answer 67

Again I urge you to consider what "U" means in this context. Hint: "Universal" is not correct; that word is an adjective.

Answer 68

Union

Answer 69

boyb39 was here for a while, and might just not have anything to contribute at the moment.

Answer 70

All added up is 500.

Answer 71

U typically represents the number of elements in the Universal set which is 500 according to this problem.

Answer 72

I checked my answer.
Unless I'm getting tired, I think I got it right.

Answer 73

500 would be the cardinality of the universal set, I would imagine. And that would be counting common element only once.

Answer 74

Why is 430 significant, @science0229 ?

Answer 75

@science0229 Why would you subtract 45, 70, and 50 but then add x?

Answer 76

It looks like science0229 subtracted \(x\), letting it be zero.

Answer 77

He has -(-x) which is +x

Answer 78

@science0229 x cant =0

Answer 79

@boyb39 Isn't there some writing before this diagram?

Answer 80

Oh yeah! I see that now! I don't see why.

Answer 81

No book just prints a diagram. There has to be something else.

Answer 82

Because 430 is the total number of the union of the three sets.

Answer 83

@Mertsj no just this graph only

Answer 84

@boyb39 So how do you know what you are supposed to do? How do you know what 500 means?

Answer 85

So you know what the numbers represent, science0229?

Answer 86

@science0229 So you are interpreting 285 as the total number of members in Set F?

Answer 87

I made an educated guess.

Answer 88

What educated guess did you make?

Answer 89

I have to eat/take a shower. Sorry, guys. I'll be back in 15-20 minutes. I promise.

Answer 90

And yes, I'm sure of my answer.

Answer 91

Take care!

Answer 92

I GOT IT!!!!

Answer 93

I'm going to assume that U is made up of F,H,B, and the "outside set"
In other words...\[(F \cup H \cup B)^c=A\]