What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: If it is sunny, then Karen is an artist. If it is sunny, then Patricia is not rich. Patricia is rich. If Karen were an artist, then it is sunny.
It is not sunny can be inferred via the modus tollens rule. If Karen were an artist, then Patricia is not rich can be inferred via the transitivity rule. It is sunny if and only if Karen is an artist can be inferred via the biconditional introduction rule. Karen is an artist if and only if it is sunny can be inferred via the biconditional introduction rule.