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Hira Javaid

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Use truth tables to show whether the following arguments are valid. If the argument is valid, explain why. If the argument is not valid, give a counterexample.
A ∨ B
B


I know the definition of valid arguments i know to make truth tables but i don't understand like how to do it...like do i need to make truth table of A or B then after it what should be the next step. Please help
 
Hira Javaid said:
Use truth tables to show whether the following arguments are valid. If the argument is valid, explain why. If the argument is not valid, give a counterexample.
A ∨ B
B
Click to expand...
I assume that the notation [imath]\dfrac{A\vee B}{B}[/imath] means If A or B is true that B is true.
[ [imath](1+1=2) \vee (2+1=4) [/imath] ] is a true statement; now is [imath](2+1=4)[/imath] a true statement?
 
Hira Javaid said:
Use truth tables to show whether the following arguments are valid. If the argument is valid, explain why. If the argument is not valid, give a counterexample.
A ∨ B
B
Click to expand...
I know the definition of valid arguments i know to make truth tables but i don't understand like how to do it...like do i need to make truth table of A or B then after it what should be the next step. Please help
pka said:
I assume that the notation [imath]\dfrac{A\vee B}{B}[/imath] means If A or B is true that B is true.
[ [imath](1+1=2) \vee (2+1=4) [/imath] ] is a true statement; now is [imath](2+1=4)[/imath] a true statement?
Click to expand...
Yes, may be?
 
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