Verbal Reasoning - Syllogism - Discussion

In each of the following questions two statements are given. Which are followed by four conclusions (1), (2), (3) and (4). Choose the conclusions which logically follow from the given statements.


Statements: All men are vertebrates. Some mammals are vertebrates.


  1. All men are mammals.
  2. All mammals are men.
  3. Some vertebrates are mammals.
  4. All vertebrates are men.

[A]. Only (4)
[B]. Only (2)
[C]. Only (3)
[D]. Only (1)
[E]. Only (1) and (3)

Answer: Option C


Akash said: (Apr 11, 2012)  
why can't all men who are vertebrates, also be mammals? In my opinion, there are three possibilities, not two.

Kiran Makwana said: (May 24, 2013)  
Third possibility is that no mammals can be vertebrates or men.

Rams said: (Jun 17, 2014)  
What about the possibility of some men are mammals?

Puneetsingh said: (Jan 21, 2015)  
All men are mammals also be true answer.

Tanmay said: (Mar 24, 2015)  
Sir I didn't understand the 2nd diagram. Here we can't tell that some mammals are men too. That not given in statement. As I know that we can't think anything extra that's not given. Is it a case of possibility ?

Anki said: (Mar 28, 2015)  
Where & how to use all+some = No conclusion.

Ravinder Kumar said: (Apr 8, 2015)  
Hello @Anki,

Here terms are "All men" and "Some Mammals" and they will always give no conclusion as they represent different categories. Solve Syllogism problems (including possibility type) in few seconds.

Mike said: (Aug 24, 2015)  
Why "all men are mammal" isn't correct?

Sumair said: (Aug 27, 2015)  
There should be three diagrams, all mans are mammals can be true if the diagram of circle of mammal in diagram 2 is increased.

Supraj said: (Mar 9, 2016)  

-UNTIL the STATEMENT is given that some men are mammals or all men are mammals or vice versa. We cannot conclude the CONCLUSION to be correct.

Neetu said: (Jun 24, 2016)  
I have to ask a little clarification.

Conclusion : Some men are vertebrates.

This conclusion is true or false, please explain your answer.

Anwar said: (Aug 1, 2016)  
If you have particular statement common, we cannot draw any conclusion.

Divyanshu_Tat said: (Sep 27, 2016)  
All + some = some,
Some men are vertebrates,so in this sentence, both are not distributed and middle term = vertebrates are also not distributed. So the answer is no conclusion.

Partha said: (Oct 4, 2016)  
Middle term cannot be present in the conclusion.

Pallabi Banerjee said: (Oct 4, 2016)  
Option 4 is also correct. Because all men are vertebrate simultaneously all vertebra are men.

Riddle42 said: (Oct 11, 2016)  
The correct answer is C, that means that conclusion 1,2, and 4 are wrong.

Conclusion 1 " all men are mammals," and 2 "all mammals are men," are the same in this context. They are wrong because they do not agree with the statements "All men are vertebrates. Some mammals are vertebrates." If all men were mammals, then not some, but all mammals were vertebrates. That is not the case.

Mohammed Shakir said: (Nov 3, 2016)  
What is a possibility here? Please, anyone, tell me clearly.

Swati said: (Dec 10, 2016)  
Conclusion can not be drawn as a middle term 'vertebrates' is not distributed in any of the statement.

Devi said: (Jan 2, 2017)  
You are right @Swati.

Alekhya said: (Jan 27, 2017)  
Yes, you are right @Swati.

Alekhya said: (Jan 27, 2017)  
Yes, you are right @Swati.

Juthika said: (Aug 2, 2018)  
Why can't some vertebrates be men isn't possible? According to me, there are 2 possibilities.

Post your comments here:

Name *:

Email   : (optional)

» Your comments will be displayed only after manual approval.