Revelian Test Deductive Reasoning 2

Question 1

Either the project is on time or the team is working overtime. The project is on time. What follows?

Accepted Answer

The team may or may not be working overtime

Answer

An inclusive 'or' statement means both conditions can be true simultaneously; knowing one is true doesn't rule out the other.

Question 2

All lawyers have law degrees. Maria does not have a law degree. What can be deduced about Maria?

Accepted Answer

Maria is not a lawyer

Answer

By contrapositive, if someone is a lawyer they have a law degree; since Maria lacks one, she cannot be a lawyer.

Question 3

Some athletes are vegetarians. All vegetarians avoid red meat. Which must be true?

Accepted Answer

Some athletes avoid red meat

Answer

The athletes who are vegetarians must avoid red meat, so at least some athletes avoid red meat.

Question 4

If the alarm sounds, everyone must evacuate. The alarm did not sound. What can we conclude?

Accepted Answer

People may or may not have evacuated

Answer

The rule only tells us what happens when the alarm sounds; when it doesn't sound, we have no information about evacuation.

Question 5

Every product with a defect is recalled. Product X was not recalled. Which must be true?

Accepted Answer

Product X has no defect

Answer

By contrapositive, if a product was not recalled, it must have no defect.

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