Consider the following premises. Charles is playing tennis or Susan is not a politician. Karen is a server. If Karen were a server, then Charles is playing tennis. Can we infer the following from them? Charles is playing tennis.
 From the fact that Charles is playing tennis or Susan is not a politician we can infer that if Susan were a politician, then Charles is playing tennis. From the fact that Karen is a server we can infer that Karen is a server or Susan is a politician. Finally, from the fact that if Karen were a server, then Charles is playing tennis, that if Susan were a politician, then Charles is playing tennis, and that Karen is a server or Susan is a politician we can infer that Charles is playing tennis. Therefore, the answer is yes.