Answer

  P Q R  | ((P→Q)&R) (~QvR) (P↔(Q↔R))
  -------+------------------------------
  T T T  |    T  T    F T     T  T     
  T T F  |    T  F    F F     F  F     
  T F T  |    F  F    T T     F  F     
  T F F  |    F  F    T T     T  T     
  F T T  |    T  T    F T     F  T     
  F T F  |    T  F    F F     T  F     
  F F T  |    T  T    T T     T  F     
  F F F  |    T  F    T T     F  T