Consider the following premises. If Susan sleeps, then Barbara is not climbing a mountain. Barbara is climbing a mountain. If Robert were curious, then Susan is sleeping. Can we infer the following from them? If we can, name the inference rule being used: Robert is curious.
 From the fact that if Susan sleeps, then Barbara is not climbing a mountain, and that Barbara is climbing a mountain we can infer that Susan is not sleeping via modus tollens. Finally, from the fact that if Robert were curious, then Susan is sleeping, and that Susan is not sleeping we can infer that Robert is not curious via modus tollens, which contradicts that Robert is curious. Therefore, the answer is no.