Free LSAT Practice Question

Question 1 of 1
ID: LSAT-LR-114
Section: Logical Reasoning
Topic: Flaw in the Reasoning
Difficulty level: Medium

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Ventilation engineer: The Brendon tunnel's fans come on whenever the monitor at the midpoint reads above the dust threshold. The maintenance log, which holds no reading at all, records the fans running on two hundred days last year, and the monitor was inspected every month and never found out of calibration. The threshold has not been altered. So on two hundred days last year the midpoint air was above the threshold.

The engineer's reasoning is most vulnerable to criticism on the grounds that it

Arests the inference on a monitor vouched for by nothing nearer than an inspection weeks before the day, over which interval a drift could set in unremarked

Bpasses from the air at the tunnel's midpoint to the air along its whole length, when the portals may differ

Ctreats the fans' running as having done something to drive the dust up, when a fan answering a reading need have contributed no part of it

Dtakes a circumstance in which the fans are bound to run for the only circumstance in which they do run, though nothing said rules out their being started for some other reason

Econcludes about two hundred separate days without the reading taken on any of them, when a maintenance log need hold no more than the fact that the fans ran

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