(3 MARKS) Suppose we know Ftaut AAB. Prove that we can conclude that Ftaut A and Ftaut B. (4 MARKS) Suppose we know Ftaut AV B. Prove that the conclusion Ftaut A or Ftaut B is false. Caution. Here you need a counter example! So you cannot argue with general A and B. (3 MARKS) Suppose we know Ftaut AAB. Prove that we can conclude that Ftaut A and Ftaut B. (4 MARKS) Suppose we know Ftaut AV B. Prove that the conclusion Ftaut A or Ftaut B is false. Caution. Here you need a counter example! So you cannot argue with general A and B