Consider the following premises. If James were rich, then it is raining. For all x_20, x_20 will play a game and x_20 is an astronaut. James is rich. Can we infer the following from them? If we can, name the inference rule being used: It is not raining.
 From the fact that for all x_20, x_20 will play a game and x_20 is an astronaut we can infer that Susan is playing a game and Susan is an astronaut via universal instantiation. Finally, from the fact that if James were rich, then it is raining, and that James is rich we can infer that it is raining via modus ponens, which contradicts that It is not raining. Therefore, the answer is no.