Eggplants are always purple. John bought a purple vegetable.

Question

Eggplants are always purple. John bought a purple vegetable. Therefore, it was an eggplant.

Which of the following depicts a similar reasoning as the above argument?

A. Jenny always eats healthy. Salmon is a healthy food. Therefore, she eats salmon.

B. Gambling is a risky hobby. Jamie likes taking risks. Therefore, she likes to gamble.

C. Except for 2, prime numbers are always odd. The number 13 is odd. Therefore, it is prime.

D. Rabbits are fast creatures. A fast creature ran by. Therefore, it may have been a rabbit.

E. Bluebirds are not always blue. A brown bird was outside the window. Therefore, it may or may not have been a blue bird.

Gprabhumir · Answer

Can somebody help me with the logic behind OA as C. I am confused between B and C.

D&E can be elimated for the use of word "may" indicating a possibility. Look at the question stem where it shows certainty.
The structure of A is not similar to that of the stem.

whatsarc · Answer

Eggplants are always purple. John bought a purple vegetable. Therefore, it was an eggplant.

Which of the following depicts a similar reasoning as the above argument?

A. Jenny always eats healthy. Salmon is a healthy food. Therefore, she eats salmon.
Yes she eats Salmon.

B. Gambling is a risky hobby. Jamie likes taking risks. Therefore, she likes to gamble.
Yes, she likes to take risks so she likes to gamble as well. Who says she cannot like to gamble?

C. Except for 2, prime numbers are always odd. The number 13 is odd. Therefore, it is prime. 
  The number 13 is odd therefore its a prime. Lets try with "The number 15 is odd therefore its incorrect". See there, that's what make this the correct answer. This is similar to the prompt where other purple veggies exist.

D. Rabbits are fast creatures. A fast creature ran by. Therefore, it may have been a rabbit.
Eliminate based on the structure.

E. Bluebirds are not always blue. A brown bird was outside the window. Therefore, it may or may not have been a blue bird. 
Eliminate based on the structure.

reed990 · Answer

Anyone can explaine why A is wrong? Is it because the order?

heyRaj · Answer

Are we selecting C instead of B because:

"Gambling is a risky hobby" -> There can be other hobbies which are risky
But option C limits this?

I am still bit unclear on the reasoning.

Vibhatu · Answer

please provide the official solution

Vibhatu · Answer

I think it all about the word "think". we need something certain. so C is correct.

Karanrev · Answer

Please explain why A is the wrong answer, as there can be so many healthy foods, not just salmon, as in the argument above

VGSH · Answer

can u explain it a bit in detail, please

guddo · Answer

Eggplants are always purple. John bought a purple vegetable. Therefore, it was an eggplant. 
 
Which of the following depicts a similar reasoning as the above argument?

The argument makes this mistake: all eggplants are purple, but that does not mean all purple vegetables are eggplants.  It treats a necessary feature as if it were enough to prove identity . In simple terms: X always has trait Y; this thing has trait Y; therefore, this thing is X. That is flawed  reverse logic .

A. Jenny always eats healthy. Salmon is a healthy food. Therefore, she eats salmon.

This has a similar flaw, but it is less close. It moves from “Jenny eats only healthy food” to “Jenny eats this healthy food.” The logic is flawed, but the setup is about a person’s habits, not classifying something by a shared trait.

B. Gambling is a risky hobby. Jamie likes taking risks. Therefore, she likes to gamble.

This is similar in a loose sense, but not as exact. It moves from “gambling is risky” to “a risk-taker likes gambling,” which adds a preference claim.

C. Except for 2, prime numbers are always odd. The number 13 is odd. Therefore, it is prime.

This is correct. It has the same flaw: prime numbers are generally odd, but that does not mean every odd number is prime. Just as a purple vegetable need not be an eggplant, an odd number need not be prime.

D. Rabbits are fast creatures. A fast creature ran by. Therefore, it may have been a rabbit.

This is not the same. The conclusion says “may have been,” not “must have been.” The original argument makes a definite conclusion.

E. Bluebirds are not always blue. A brown bird was outside the window. Therefore, it may or may not have been a blue bird.

This does not match the flawed reasoning. It gives a cautious possibility, not an invalid definite conclusion.

Answer: (C)

Eggplants are always purple. John bought a purple vegetable.

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Eggplants are always purple. John bought a purple vegetable.