medium · LSAT Logical Reasoning
A city planner argues that because every bridge in the county was inspected and found to be structurally sound, the entire county's transportation infrastructure is therefore in excellent condition.
Which one of the following identifies the most significant logical flaw in this reasoning?
- It judges from a sample of inspected bridges that is plainly too small to support any conclusion about the bridges.
- It concludes that an entire system has a quality merely because one type of component within it has that quality.
- It neglects the chance that the county's bridges will deteriorate at sharply different rates over coming years.
- It treats a condition merely sufficient for sound infrastructure as though it were strictly necessary.
- It assumes, without any argument, that structurally sound bridges are the single most important element of a transit network.
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More LSAT Logical Reasoning practice
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