Truth Tables MATH HELP

[thescreensavers]

How the hell I don't get it all.

Scan of PG

Number 10 How do you do it. I don't understand

 

[imported_hscorpio]

http://en.wikipedia.org/wiki/Truth_table

 

[StevenYoo]

the '~' means 'not'

so if q is T, then ~q is F

the AND operator (the ^) is only true when both values are true (ie, when they're both T and T).

 

[Mathlete]

I love truth tables.

 

[thescreensavers]

Originally posted by: hscorpio
http://en.wikipedia.org/wiki/Truth_table

I looked at it it confused me more.Like How exactly step by step do you solve 10

 

[StevenYoo]

Originally posted by: Mathlete
I love truth tables.

then why don't you MARRY one?

bwahaha, i'm hilarious.

 

[her209]

Wow... this is fundamental logic. How can anyone not understand this?

 

[mugs]

~ = not and ^ = AND I think

 

[Cattlegod]

Dude, do you work at a Burger King in Michigan?

I saw one of the register guys doing truth tables on Friday.

 

[StevenYoo]

Originally posted by: her209
Wow... this is fundamental logic. How can anyone not understand this?

yes, highly illogical, captain.

 

[kranky]

The last two colums mean not q and p AND (not q)

So on the second line, q is False, so "not q" must be True.
Then, p AND (not q) is done by substitution. p is T, we know that "not q" is F, so we're left to evaluate the expression T AND F - which evaluates to F.

 

[mugs]

Originally posted by: her209
Wow... this is fundamental logic. How can anyone not understand this?

Give him a break, everyone has to learn it sometime. Hopefully he's no older than 13 though.

 

[Soccer55]

Well, if q is false, then what would ~q be? For that, you would have to know what the operator ~ means. For the next column, if you have that p is true and ~q is false, then use the rules for the operation ^ to determine whether p^~q is true or false.

-Tom

 

[Mathlete]

For the or statements (\/) one or the other or both needs to be true

 

[chuckywang]

~ means NOT.

^ means AND.

That should be all the info you need. It's kinda hard to say more without giving away the answer.

 

[imported_hscorpio]

Originally posted by: thescreensavers

Originally posted by: hscorpio
http://en.wikipedia.org/wiki/Truth_table

I looked at it it confused me more.Like How exactly step by step do you solve 10

Did you understand the "~q" column at least? You just reverse whatever q is. The "^" column is a little harder but still very easy once you know what AND is. Think of it as two switches connected in series to a light bulb. Both switches have to be on (true) in order for the lightbulb to be on(true).

 

[Mathlete]

Just wait until if-then (->) and if and only if (iff, <->) statements!

 

[thescreensavers]

waa ;scraches head: I dont get any of waht your all saying

 

[Soccer55]

Originally posted by: thescreensavers
waa ;scraches head: I dont get any of waht your all saying

Let's forget about filling in the blank spots in the truth table for now. Do you at least understand the meanings of the things that are already there?

-Tom

 

[Sc4freak]

Ahaha, do this from the view of a C++ programmer, and take all the operators as bitwise operations

 

[sao123]

Originally posted by: thescreensavers
waa ;scraches head: I dont get any of waht your all saying

Directions:
In each row...Use the values of the first 2 columns, to figure out the values for the second 2 columns.

Example Row 1
given: P is true, Q is true
What is (not Q)? well if Q is true, then the opposite of Q is False. So (not Q) is false.

What is P and (not Q)? Well if we just determined that (not Q) is false.
Hopefully you remember the basic and table...
T + T = T
F + T = F
T + F = F
F + F = F

So then P AND False is False.

So ROW 1 would look like
[T][T][F][F]

 

[Mathlete]

Think of p, q and r as parts of a statement. In order to test the TRUTH of the statement we need to evaluate the truth of the parts.

You also need to understand the "and" and "or" operators. Two atatements joined by the "and"(/\) operator need to both be true for the statement to be true. In an "or"(\/) statement only one part needs to be true for the statement to be true.

For example:

If p is true
q is true
r is false

Then
p /\ q = True /\ True
=True

p /\ r = True /\ False
=False

 

[imported_hscorpio]

Here I drew an awesome picture explaining it. Truth

That plus some of the detailed replies given to you here should do it. If you still don't get it then I think you are just not trying or are too frustrated or something. This is pretty basic logic that you probably know but are letting the symbols confuse you.

 

[nycxandy]

LOL

 

[thescreensavers]

so no one can walk me through number 10 click the link and look at question 10. Since you all know it so well You can walk me through it.

I am screwed for the test today

BTW: thanks every one for trying to help me. maybe I am just stupid. Or its really basic and I cant see it b/c of this truth table that complicates things.

BTW2: Why would I need to learn this for what job requires knowing a truth table.