Mid-point or class mark of the 4th class is

The range of the data is

Which arguments are valid?

(i)[(p → q) ∧ ~ q] → ~ p  

(ii)[(p → q) ∧ ~ p] → ~ q

(iii)[(p → q) ∧ q] → p

(iv)[(p → q) ∧ p] → q

The argument “ If it is rain, then Mg Mg will be sick. Mg Mg was not sick. Therefore, it did not rain.” is 

Which statement is false if the domain consists of all integers.

Which statement is true if the domain consists of all integers.

Which compound proposition is not logically equivalent?

Which conditional statement is false?