determine whether the argument is valid or invalid.

Please see attchment.

Question

determine whether the argument is valid or invalid.

Please see attchment.

anonymous · Answer

attachment

mathteacher1729 · Answer

You can type those symbols by using the equation button at the bottom left of the text box. :) 

c \vee d, \sim c \therefore d 
gives 
$$c \vee d, \sim c \therefore d$$

mathteacher1729 · Answer

Here is a useful list of logical symbols: http://en.wikipedia.org/wiki/List_of_logic_symbols We are dealing with "logical disjunction" --- "OR" The statement A ∨ B is true if A or B (or both) are true; if both are false, the statement is false.

mathteacher1729 · Answer

Just because c is false... that has NO bearing on d.  d could be true, or it could be false.

anonymous · Answer

so then the statement is invalid

mathteacher1729 · Answer

Yeah, we can't draw any meaningful conclusions from it until we're give more info about d.

anonymous · Answer

then do we have to create a truth table then.