Consider the following premises. For all x_17, x_17 will go running or x_17 is a server. For all x_17, x_17 is not a police officer. For all x_17, x_17 will go running if and only if x_17 is a police officer. If John were a server, then it is snowing. Can we infer the following from them? If we can, name the inference rule being used: Mary is rich.
We cannot infer that from the premises. Therefore the answer is no.