Conditional Statements and Venn Diagrams PLEASE HELP

owenflo · 2015-06-28 14:21:41

Question 14, F?

Bob · 2015-06-28 19:45:45

hi owenflo,

Q11. I agree with your answer.

Q12. The inverse would be "If it's not a small pinpricks of light in the night sky then it's not a star."

I'm confused by this question. Why has a(n) popped into the question. If we are supposed to accept that the statement is true then it contradicts the original statement which would make it a counter example.

Q13. I cannot find an answer here. A is just a re-statement of the original. B is not a valid conclusion. C may be correct in the real world but in logic theory we cannot think like that. We have to reach conclusions on the basis of what we are told and there's no reason to reach conclusion C. D has nothing to do with the statement at all. E: The inverse would be "If someone is not a baseball player then they are not an athlete." Again we cannot conclude this from the original. F: The converse would be If someone is an athlete then they are a baseball player."

Q14. I've no idea what this question means. Where did q come from?

Hiont for the remaining questions coming up.

Bob

Bob · 2015-06-28 19:54:03

Q17 - 20.

There are six sets here, girl soccer players, girl baseball players and so on.

A diagram showing six sets would be impossibly difficult to deal with. But there is a dodge that makes it simpler. A player cannot be both a boy and a girl. So make three circles, one for soccer, one for baseball and one for tennis. Use two coloured pens, say red for girls and blue for boys. Write information into the regions using the appropriate colour.

I would start with "1 boy played all three sports" and "1 girl played all three sports". You can put a red 1 and a blue 1 in the region where all the sets overlap.

There are a few places where you don't know about the boy/girl split, so you could use a third colour, say green, for these.

I found that there was not enough information to work out every region into blues and reds, but you can answer all the questions anyway.

owenflo · 2015-06-29 10:42:41

14. What is q?

ASomeone is an athlete.
BSomeone is a baseball player.
CAll baseball players are athletes.
DAll athletes are baseball players.
E Baseball player
F Athlete

That is all I know for question 14

owenflo · 2015-06-29 10:52:27

For Q17-20

17. E
18.F
19.B
20.A

?????

Bob · 2015-06-29 19:34:30

hi owenflo,

I agree with your answers to Q17 and Q19.

Are you able to post your diagram for this question?

Bob

owenflo · 2015-06-30 14:44:43

I dont understand what you are asking

For Q13 I put C and it was incorrect.. For Q14 I put F and got it wrong.
Q18 I put B and got it wrong.
Q20 D I also got wrong
I should've waited for help

Bob · 2015-06-30 19:10:20

Please make a diagram and post it here.

Bob

owenflo · 2015-07-01 11:13:12

How do you make a diagram?

Bob · 2015-07-01 19:54:01

Here's a link to a really useful (free) program for geometry:

http://www.geogebra.org/cms/

Or you could just draw on paper and photograph it.

To put the image onto this site you could join www.imgur.com

Once you have uploaded your image you copy and paste the bbcode into your post.

Bob

There are other free sites that allow you to upload images like this.

owenflo · 2015-07-03 11:41:42

I entered in all of my answers and got #13,14,18 and #20 wrong. Can you please help me

Bob · 2015-07-03 19:26:04

I have no idea about 13 and 14. perhaps someone else will know what they want for these.

Here is my diagram for the others:

The boys numbers are in blue; girls in red; unknown in green.

Bob

owenflo · 2015-07-05 05:59:16

18. How many students played soccer and baseball, but not tennis?
A5
B10
C3
D4
E 7
F 13

owenflo · 2015-07-05 06:00:17

20. How many girls played only baseball?
A7
B2
C3
D4
E 10
F 1

owenflo · 2015-07-05 06:05:35

20. is D
Having trouble with Q18

Bob · 2015-07-17 21:50:22

hi owenflo,

Q20. 4 is the number of boys who only play baseball. The girl numbers are in red

Q18.

For this question you must find the single region that is in the soccer circle, AND it's in the baseball circle, but it's NOT in the tennis circle. In my diagram, there are two numbers there (for boys and girls). You will have to add them together to get the answer.

Bob

Math Is Fun Forum

#26 2015-06-28 14:21:41

Re: Conditional Statements and Venn Diagrams PLEASE HELP

#27 2015-06-28 19:45:45

Re: Conditional Statements and Venn Diagrams PLEASE HELP

#28 2015-06-28 19:54:03

Re: Conditional Statements and Venn Diagrams PLEASE HELP

#29 2015-06-29 10:42:41

Re: Conditional Statements and Venn Diagrams PLEASE HELP

#30 2015-06-29 10:52:27

Re: Conditional Statements and Venn Diagrams PLEASE HELP

#31 2015-06-29 19:34:30

Re: Conditional Statements and Venn Diagrams PLEASE HELP

#32 2015-06-30 14:44:43

Re: Conditional Statements and Venn Diagrams PLEASE HELP

#33 2015-06-30 19:10:20

Re: Conditional Statements and Venn Diagrams PLEASE HELP

#34 2015-07-01 11:13:12

Re: Conditional Statements and Venn Diagrams PLEASE HELP

#35 2015-07-01 19:54:01

Re: Conditional Statements and Venn Diagrams PLEASE HELP

#36 2015-07-03 11:41:42

Re: Conditional Statements and Venn Diagrams PLEASE HELP

#37 2015-07-03 19:26:04

Re: Conditional Statements and Venn Diagrams PLEASE HELP

#38 2015-07-05 05:59:16

Re: Conditional Statements and Venn Diagrams PLEASE HELP

#39 2015-07-05 06:00:17

Re: Conditional Statements and Venn Diagrams PLEASE HELP

#40 2015-07-05 06:05:35

Re: Conditional Statements and Venn Diagrams PLEASE HELP

#41 2015-07-17 21:50:22

Re: Conditional Statements and Venn Diagrams PLEASE HELP

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