LNAT Logical Deduction 3

Question 1

Either the witness is lying or the evidence was planted. The witness is telling the truth. What follows?

Accepted Answer

The evidence was planted

Answer

In a disjunction, if one option is false, the other must be true; so if the witness is not lying, the evidence was planted.

Question 2

All felonies carry imprisonment. This offence does not carry imprisonment. Therefore:

Accepted Answer

This offence is not a felony

Answer

By contrapositive: if not imprisoned, then not a felony — the offence is not a felony.

Question 3

Most lawyers earn more than teachers. James is a lawyer. Which is the most logically warranted conclusion?

Accepted Answer

James probably earns more than most teachers

Answer

Since most (not all) lawyers earn more, James is probably in that majority but it is not certain.

Question 4

Passage: 'Speed cameras reduce accidents only where drivers know they are installed.' Which scenario most weakens this claim?

Accepted Answer

An unmarked camera site sees a 35% accident drop

Answer

An unmarked camera reducing accidents contradicts the claim that awareness is necessary for the effect.

Question 5

If the statute is ambiguous, the court applies the literal rule. The statute is clear. What can be concluded?

Accepted Answer

Nothing can be concluded about which rule applies

Answer

The conditional tells us what happens when the statute IS ambiguous; it says nothing about what happens when it is clear.

LNAT Practice Test