Final answer:
Using deduction and a set of rules and conditions, one can determine what must be true. Deductive reasoning relies on the structure of arguments to guarantee truth if the starting premises are true.
Step-by-step explanation:
Using deduction, when starting from a given set of rules and conditions, helps you determine what must be true. Deductive reasoning focuses on the structure of arguments, ensuring that if the premises are true, the conclusion is also necessarily true. This type of logical reasoning helps identify factual correctness within a logical framework.
For example, if you have two premises where 'All mammals are vertebrates' and 'All tigers are mammals', the conclusion that 'All tigers are vertebrates' must be true. This is an example of a valid deductive inference. In this context, deduction is not used to figure out what may be false or what may be true, but rather, what must logically follow from the accepted premises.