In Exercises $1324,$ use propositional logic to prove that the argument is valid. $14.$ A $/\backslash ($B $-->$ A$)-->$ B$18.[$A $-->($B $-->$ C $)]/\backslash ($A V D$)/\backslash$ B $-->($D $-->$ C$)24.[$A $-->($B V C $)]/\backslash$ C$-->($A $-->$ B$)$