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Best Syllogism Tutorial | Syllogism Concepts Explained Using Examples and Real Questions

Contributed By Shuchi 2 years ago 3301 Views

Syllogism

This Topic is one of the easiest topic if concepts are clear and requires less time compared to other topics. So here we will try to cover all types of questions asked from syllogism In Banking & other competitive exams.

Number of Questions from Syllogism asked in Banking Exams: 5

Allotted Marks: 1 for each Question

Ideal time taken to find out Solutions: 5 minutes Maximum.

For better understanding we will solve problems of syllogism with the help of Venn Diagram. Before getting into topic directly we will try to understand some basic concepts related to it.

1.All dogs are Cats. (All A's are B's)

So it can be drawn like this:

_20170517_005152.jpg

So there are two ways to draw above given statement. But generally we draw diagram (ii).

2. Some Cats  are Dogs (Some A's are B's)

_20170518_162026.jpg

Here these two Venn Diagrams are possible for one statement but we will prefer to draw (i) because we will try minimum overlapping. Drawing Diagram using this technique is known as Minimum Overlapping technique.

3. Some dogs are not cats. (Some A's are not B's)

These two diagrams represent the given statement however we will always draw the (i) diagram. Diagram(ii) is just to develop the sense that highlighted area represents the statement too but we will avoid drawing it as it may add complexities.

4. No cat is dog/ No dog is cat/ All dog are not cat. (No A's is B's, No B's are A's, All A's are not B's)

_20170518_163939.jpg

So this single diagram may be drawn for all three types above given statements.

5.(A) All Dogs are cats. (B) No rat is dog. (All A's are B's, No C's are A's)

_20170517_014547.jpg

In (iii) & (iv)Diagram, it’s a case of possibility & we can think of every possible diagram before answering as long as it does not contradict the given statement. But you are not supposed to draw all the possible diagrams in Exam hall.

Here few points are needed to keep in mind:

  1. You need not draw every possible diagram in exam. You should save your precious time in exam hall.
  2. Try to draw minimum diagrams, imagine diagrams & try to solve mentally as it will boost up your speed.
  3. Possibility arises only in negative statement(like second statement given in above Example).
  4. We will draw Venn Diagram using Minimum Overlapping Technique.

Minimum Overlapping Technique: As it’s name suggest, we will cover only that area through circle which is given in statement for rest we will cover as minimum as possible. To understand see this Example

6. (A)Some jugs are glasses (B)All glasses are plates.

_20170517_020319.jpg

Now we will try to understand the concepts through examples.

7 .Statements (A) No car is van (B) All jeeps are van (C) Some bikes are jeeps.

Conclusions(i)No jeep is a car (ii)Atleast some bike are van.

_20170518_001942.jpg

 

From Diagram it is clear that (i) & (ii) both follow.

Note: Word ‘Atleast’ must be always omitted.

8.Statements (A) Some coolers are fans (B) Some fans are ac.

Conclusion (i) Some ac are not fans (ii) Some ac being coolers is a possibility

_20170518_003818.jpg

It is very clear from the diagram that (i) does not follow but (ii) follows.

9. Statements: (A) All dogs are cat (B)No rat is dog.

Conclusions: (i) No cat is rat. (ii) Some cats are rats.

_20170517_014547.jpg

So here we will think about all possible diagrams,Conclusion (i) is possible from diagram (iv) (ii) is also possible from diagram (iii)

Again If Conclusion(i)follows then (ii) will never so Either (i) or (ii) follows.

10. Statements: (A) Some movies are films (B) No film is a show (C) All show are pictures

Conclusions: (i) Atleast some pictures are films (ii) No show is a movie (iii) No pictures are films.

_20170518_011413.jpg

In negative conclusions we extend possibilities & think of all possible cases without violating statements’ conditions so there is one possible case

_20170518_012240.jpg

So from diagram we can clearly answer either (i) or (iii) follows.

 

11. Statement: (A) Some bikes are cars (B) All ships are trains (C) Atleast some buses are cars

(D)No buses are ships.

Conclusions (i) All cars are trains (ii) Some trains are ships (iii) Some buses are bikes (iv) Some cars are buses.

_20170518_013504.jpg From diagram we can answer only (ii) & (iv) follows.

12. Statements: (A) Some cakes are roses (B) All roses are Trucks (C) No truck is brick

(D) Atleast some brick are hotels.

Conclusions: (i) Some trucks are cakes (ii) Some bricks are roses (iii) All cakes are trucks (iv)

Some hotels are cakes.

_20170518_014832.jpg Only (i) follows.

13. Statements: (A) All tigers are dogs (B) Some tigers are cats (C) All cats are lions (D) All cows are lions

Conclusions: (i) Some dogs are lions (ii) Some cows are dogs (iii) Some lions are tigers (iv) All cats are dogs.

_20170518_021252.jpg

So here from diagram we can answer only (i) & (iii) follow.

Now we will learn to deal Negative Statements & Conclusions as well

14. Statements: (A) Some girls are intelligent (B) All brave are clever (C) All intelligent are beautiful (D) No beautiful is brave.

Conclusions: (i) Some beautiful are girls (ii) Some clever are intelligent (iii) No beautiful is clever (iv) No girl is clever.

Conclusion (i) follows only as it is visible from diagram _20170518_150248.jpg

For better understanding, one this case is also possible as here no given Statements’ condition are violating)

_20170518_151156.jpg

So only (i) follows.

Note: You are not advised to draw all possible diagrams, You only just need to imagine all possible diagrams & answer accordingly.


15.
Statements: (A) Atleast some trams are autos (B) All trams are cycles (C) All cycles are trucks (D) No trains is cycle.

Conclusions: (i) Some trucks are autos (ii) No tram is train (iii) No train is auto (iv) Some trains are not trucks.

_20170518_152627.jpg

Conclusion (i) & (ii) follows.(Think of (iii) & (iv),they do not follow as they are negative so we will extend the possible diagrams mentally without violating statements)

Now we will try to grasp the Concept of Possibilities related Conclusions

16. Statements: (A) All cats are rats (B) Some jets are mats (C) No rat is jet (D) All mats are fish.

Conclusions: (i) No jet is cat (ii) No cat is mat (iii) some cat being fish is a possibility (iv) All rats being mat is a possibility.

_20170518_153849.jpg

Conclusion (i),(iii) & (iv) follows,(ii) does not follow because it’s a negative conclusion. So, we will extend possibilities, then it may be possible because nothing is said about this in the statement.

17.Statements: (A) All locks are doors (B) All doors are bags (C) No tickets are doors (D) All tickets are keys.

Conclusions: (i) Some locks are not tickets (ii) All locks being key is a possibility (iii) All bags being key is a possibility (iv) All keys being bag is a possibility.

_20170518_155036.jpg

All follow.

18. Statements: (A) All computers are CPUs (B) All keyboards are mouse (C) No mouse is computer (D) Some CDs are mouse.

Conclusions: (i) Some CDs are not CPU (ii) No computer is keyboard.

_20170518_160338.jpg

Only (ii) follows.

At last we will try to develop the technique to answers Either/Or Conclusions

19. Statements: (A) All computers are CPUs (B) All keyboards are mouse (C) No mouse is computer (D) Some CDs are mouse.

Conclusions: (i) Some CPUs are mouse (ii)No CPU is mouse

So from the above diagram we can see clearly if (i) follows then (ii) will never & vice versa so Either (i) Or (ii) follows.

We hope it will help you in all the ways to understand the concept of Syllogism. Keep practicing as much as you can so that you can solve all the questions asked from this topic in exam 



All Tutorials Logical Reasoning

3301 Views
See previous comments 5 of 8 comments

pankul 2 years ago

"UNIQUE TUTORIAL BY MAHIMA"    KEEP IT UP

- Reply (1)

Shuchi 2 years ago

Thanks lot

- Reply

swati sucharita 2 years ago

sir I want to buy the test series..bt the problem is the online test appearance is not like as in actual exam paper...can u pls provide the paper as looked like in real exam.. means not showing all paper in left hand corner.do it just like d attachment.

oli.png (151.0 KB)
- Reply (3)

GovJobAdda, Bengaluru Institute 2 years ago

Hi Swati,

We will very soon change the interface to the interface in the actual exam :-)

- Reply

pankaj sitabdar 2 years ago

symbols configuration is not properly done in practice tests i.e. symbols in inequalities are hard to understand. here is an exampe

a.JPG (5.5 KB)
- Reply

swati sucharita 2 years ago

if I buy now then can I used d changed interface later??

- Reply

RAVI KUMAR 2 years ago

some dog is cat 2nd diagram is wrong

- Reply (0)

RAVI KUMAR 2 years ago

some dog is cat 2nd diagram is wrong

- Reply (0)

sushant pandey 2 years ago

thanks sir

- Reply (0)

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