Question

is this valid or invalid
If we're in a war then I will join the army
If I join the arm then I will fight

Answer 1

You would need more information for it to be "valid"

Answer 2

it seems valid to me

Answer 3

I joined the army and never fought

Answer 4

Based on the information given you can not prove that it is valid.

Answer 5

If you can find a counter example, it is not valid

Answer 6

it is not valid. needs more information>

Answer 7

both invalid

Answer 8

okay

Answer 9

Thanks for repeating what I said people.

Answer 10

does not need more information, these are logic statements

Answer 11

? Are you kiding me precal?

Answer 12

Not everyone in the army even fights?

Answer 13

Please just sit down.

Answer 14

yes, doctors do not fight, nurses do not fight.

Answer 15

So invalid

Answer 16

You are trained to fight but you are not always stationed in the front lines

Answer 17

Yes? I said it was invalid knowing this.

Answer 18

these are logic statements........

Answer 19

we need the question, for example: A --> B and B---> C, then A-->C
the question is that "is this valid or not"
you have 2 conditions without the link, how can you know it is valid or not?

Answer 20

does not need more information, these are logic statements When you said this I thought that you were saying that it was valid.

Answer 21

If we're in a war then I will join the army
ok so what about the air force, marines, etc......ie not the army

Answer 22

no you have to follow the rules of logic statements

Answer 23

That is Boolean statement, right?

Answer 24

so is it valid or invalid?

Answer 25

Invalid

Answer 26

You could maybe try to proove it valid?

Answer 27

Not sure about Boolean Statements. Logic statements are the foundation of mathematics. This is how we build our theorems or I should say construct our mathematical proofs.

Answer 28

Is it trying to say that If we're in a war then I will join the army
If I join the army then I will fight like this is combined into one?

Answer 29

To prove something invalid, all you need is "one" counterexample.

Answer 30

@precal Your honestly making this way more difficult then it needs to be?

Answer 31

Why?

Answer 32

EXACTLY

Answer 33

p implies q
q implies p
not p implies not q
not q implies not p

Answer 34

then you have to learn to build truth tables

Answer 35

You have issues

Answer 36

You just really want the medal or something?

Answer 37

btw I did not make this stuff up
then you would have to call me Dr. Precal
only issues I have are "math issues"