Consider the following premises. It is not snowing. It is snowing if and only if Thomas is reading a book. If Jennifer were happy, then Thomas is reading a book. Can we infer the following from them? If we can, name the inference rule being used: Jennifer is happy.
 From the fact that it is snowing if and only if Thomas is reading a book we can infer that if Thomas reads a book, then it is snowing via biconditional elimination. From the fact that if Thomas reads a book, then it is snowing, and that it is not snowing we can infer that Thomas is not reading a book via modus tollens. Finally, from the fact that if Jennifer were happy, then Thomas is reading a book, and that Thomas is not reading a book we can infer that Jennifer is not happy via modus tollens, which contradicts that Jennifer is happy. Therefore, the answer is no.