Consider the reasons .
Note that the product of these two ratios is 1, that is, .
In this case we can state that are inverse reasons.Two reasons are inverse to each other when their product is equal to 1.
are inverse reasons because .
Note that, in inverse reasons, the antecedent of one is the consequence of the other, and vice versa.
1) A zero antecedent ratio has no inverse.
2) To determine the inverse ratio of a given reason, we must exchange (exchange) its terms. Example:
The inverse of .Next: Equivalent Reasons