medium · LSAT Logical Reasoning
A specimen belongs to genus L if and only if it has either ridge R or ridge S. The specimen has neither ridge. Therefore, it does not belong to genus L.
Which one of the following arguments is most similar in its pattern of reasoning to the argument above?
- A machine is approved if and only if it is both safe and inexpensive. It is safe and inexpensive. Therefore, it is approved.
- A route is designated only when it has both a bridge and a ferry link. It has neither, so it is not designated.
- A route is designated exactly when it has both a bridge and a ferry link. It lacks a bridge, so it is not designated.
- Having a bridge or ferry is sufficient for designation. The route is not designated, so it has neither link.
- A route is designated exactly when it has a bridge or a ferry link. This route has neither, so it is not designated.
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