1.

Can
one tell whether an argument is valid or not from the following information? 

(i)

Its
premises are true and its conclusion true. 

(ii)

Its
premises are true and its conclusion is false. 

(iii)

At
least one of its premises is false and its conclusion is true. 

(iv)

At
least one of its premises is false and its conclusion is false.

2.

Can
one have an invalid argument which meets the following conditions?


(i)

Its
premises are consistent with its conclusion? 

(ii)

Its
premises are inconsistent and its conclusion is false. 

(iii)

Its
premises is a necessary truth and its conclusion is true. 
3.

Can
one have a valid argument which meets the following conditions? 

(i)

Its premises are consistent but its conclusion is false. 

(ii)

Its
conclusion is inconsistent with the premises. 

(iii)

Its
conclusion is inconsistent with the premises, and the premises are
consistent. 

(iv)

The
negation of its conclusion is consistent with one of the premises. 

(v)

The
negation of its conclusion is inconsistent with the negation of one
of the premises. 

(vi)

The
negation of its conclusion is inconsistent with the negation of one
of the premises, and the argument would not be valid without this
premise. 