GATE Civil 2023 Set 1 | GA Question: 6

Question

Based only on the truth of the statement 'Some humans are intelligent', which one of the following options can be logically inferred with certainty?

• A. No human is intelligent.
• B. All humans are intelligent. 
• C. Some non-humans are intelligent. 
• D. Some intelligent beings are humans.

Answer 1

Given that, 

• Some humans are intelligent.

Now, 

• A. No human is intelligent. We cannot infer this; it's not supported by the statement.
• B. All humans are intelligent. We cannot infer this either; the statement doesn't provide information about all humans.
• C. Some non-humans are intelligent. We cannot infer this because the statement specifically mentions humans, not non-humans.
• D. Some intelligent beings are humans. This can be logically inferred from the statement, as it indicates that there are intelligent humans.

Correct Answer: D

Answer 2

(D) Some intelligent beings are humans.

Here's why the other options are not necessarily true:

• (A) No human is intelligent: This contradicts the original statement by implying that all humans are not intelligent, which is not supported by the statement "Some humans are intelligent."
• (B) All humans are intelligent: This makes a stronger claim than the original statement and cannot be inferred with certainty based on "Some humans are intelligent." It's possible that only some specific subset of humans are intelligent.
• (C) Some non-humans are intelligent: The original statement only focuses on humans and doesn't provide any information about non-humans. Therefore, we cannot draw any conclusions about their intelligence based solely on the information given.