Mensa Mensa IQ Deductive Reasoning Puzzles 2

Question 1

All roses are flowers. Some flowers fade quickly. Therefore, which conclusion is valid?

Accepted Answer

No valid conclusion can be drawn

Answer

The 'some flowers' that fade quickly may or may not include any roses, so nothing certain follows about roses.

Question 2

If no cats are dogs and all tigers are cats, what must be true?

Accepted Answer

No tigers are dogs

Answer

Since tigers fall entirely within cats and cats share nothing with dogs, tigers share nothing with dogs.

Question 3

Tom is taller than Sara. Sara is taller than Mike. Mike is taller than Joe. Who is shortest?

Accepted Answer

Joe

Answer

The chain descends Tom > Sara > Mike > Joe, making Joe the shortest.

Question 4

Every member of the club pays dues. Raj does not pay dues. Therefore:

Accepted Answer

Raj is not a member

Answer

If all members pay dues and Raj does not, Raj cannot be a member.

Question 5

Some students are athletes. All athletes are healthy. Which follows?

Accepted Answer

Some students are healthy

Answer

The students who are athletes must be healthy, so at least some students are healthy.

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