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Mathematics 16 Online
OpenStudy (anonymous):

Construct a truth table for this statement q ∨ (p → ∼r)

OpenStudy (anonymous):

Can any1 help me with this?

OpenStudy (anonymous):

sure

OpenStudy (anonymous):

do you know how to start?

OpenStudy (anonymous):

What does this sign mean ∨

OpenStudy (anonymous):

I'm not familiar with the proper notation

OpenStudy (anonymous):

Satellite, I am not sure how to start

OpenStudy (anonymous):

you need all possible combinations of T and F for the three variables p, q, r so it will have 8 rows

OpenStudy (anonymous):

Okay

OpenStudy (anonymous):

V= OR It means As long as one side of the variables is true then the whole thing is true

OpenStudy (anonymous):

it should look like this \[\begin{array}{|c|c|c} P & Q & R \\ \hline T & T & T \\ T & T & F \\ T & F & T \\ T & F & F \\ \hline F & T & T \\ F & T & F \\ F & F & T\\ F & F & F \\ \hline \end{array}\]

OpenStudy (anonymous):

now we need to add \(\lnot r\)

OpenStudy (anonymous):

That is only the first part?

OpenStudy (anonymous):

we make no assumptions, we just compute like donkeys \[\begin{array}{|c|c|c|c} P & Q & R & \lnot{}R \\ \hline 0 & 0 & 0 & 1 \\ 0 & 0 & 1 & 0 \\ 0 & 1 & 0 & 1 \\ 0 & 1 & 1 & 0 \\ \hline 1 & 0 & 0 & 1 \\ 1 & 0 & 1 & 0 \\ 1 & 1 & 0 & 1 \\ 1 & 1 & 1 & 0 \\ \hline \end{array}\]

OpenStudy (anonymous):

oh yes, lots more to go

OpenStudy (anonymous):

Alright

OpenStudy (anonymous):

damn i used 0 and 1, you need T and F i will let you adjust

OpenStudy (anonymous):

I am still working on table one, you can keep going

OpenStudy (anonymous):

now we need \(p\to \lnot r\)

OpenStudy (anonymous):

for this we look at the column \(p\) and \(\lnot r\) and the implication is only false is \(p\) is true and \(\lnot r\) is false

OpenStudy (anonymous):

So O is F and 1 is T?

OpenStudy (anonymous):

\[\begin{array}{|c|c|c|c|c} P & Q & R & \lnot{}R & P\Rightarrow{}\lnot{}R \\ \hline 0 & 0 & 0 & 1 & 1 \\ 0 & 0 & 1 & 0 & 1 \\ 0 & 1 & 0 & 1 & 1 \\ 0 & 1 & 1 & 0 & 1 \\ \hline 1 & 0 & 0 & 1 & 1 \\ 1 & 0 & 1 & 0 & 0 \\ 1 & 1 & 0 & 1 & 1 \\ 1 & 1 & 1 & 0 & 0 \\ \hline \end{array}\]

OpenStudy (anonymous):

no, 0 are true, 1 are false

OpenStudy (anonymous):

See I was right first half is True

OpenStudy (anonymous):

1 is True 0 is False

OpenStudy (anonymous):

Okay thanks

OpenStudy (anonymous):

and finally, we need \(q\lor (p\to \lnot r)\) which, being an or statement, is true unless both are false

OpenStudy (anonymous):

\[\begin{array}{|c|c|c|c|c|c} P & Q & R & \lnot{}R & P\Rightarrow{}\lnot{}R & Q\lor{}(P\Rightarrow{}\lnot{}R) \\ \hline 0 & 0 & 0 & 1 & 1 & 1 \\ 0 & 0 & 1 & 0 & 1 & 1 \\ 0 & 1 & 0 & 1 & 1 & 1 \\ 0 & 1 & 1 & 0 & 1 & 1 \\ \hline 1 & 0 & 0 & 1 & 1 & 1 \\ 1 & 0 & 1 & 0 & 0 & 0 \\ 1 & 1 & 0 & 1 & 1 & 1 \\ 1 & 1 & 1 & 0 & 0 & 1 \\ \hline \end{array}\]

OpenStudy (anonymous):

Okay this will take a while for me to do, thanks

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