Begin the truth table with this:

~A ∨ (B ⊃ A)
 T    T    T
 T    F    T
 F    T    F
 F    F    F


Then do the ~ before the A:

~A ∨ (B ⊃ A)
FT    T    T
FT    F    T
TF    T    F
TF    F    F
*

Then do the ⊃ between B and A

~A ∨ (B ⊃ A)
FT    T T  T
FT    F T  T
TF    T F  F
TF    F T  F
        *

Finally do the v

~A ∨ (B ⊃ A)
FT T  T T  T
FT T  F T  T
TF F  T F  F
TF T  F T  F
   *

A contingent statement is a statement which could logically 
be either true or false.

Since 3 of the lines of the truth table is false and the
others are true, this is a contingent statement.

Edwin