a) Fill out the truth table: |P|9r|p+9197r|p+q)^(q+r)p+r|[(p+q)^(q+r)] (p+r) | TTT TTF TFT TFF FTT FTF FFT FFF b) Let p,q,r be propositions. Is the compound proposition [(p+)^(q + r)] (p+r) a tautology? Explain why/why not. c) Let p,q,r be propositions. Use basic logical equivalences to prove that the compound propositions (p^9) r and p(qVr) are logically equivalent. d) What are the truth values of the statements Vnm(n+m= 0) and 3nVm(n