Massey Explains logic

or Verbal Reasoning skills for CAT and GMAT

Deductive Logic and Syllogism

Deductive Logic and Syllogisms from Ankur Suryavanshi on Vimeo.

Understanding Logical Possibilities , logical necessities , logical possibilities , Understanding difference between deductive versus inductive ,and Syllogisms

Conditionals Analysis

or If then , Only if then , Logical Consistency etc

If then , only If , and Conditionals Analysis from Ankur Suryavanshi on Vimeo.

meaning of If X then Y
only if X then Y
Sufficiency , Necessity
Logical Possibilities , Necessities and Impossibilities
Logic in action

Either Or and “Not” in If then conditionals

Either or And NOT in Conditionals from Ankur Suryavanshi on Vimeo.

Concluding part of the Deductive logic series , Massey Dissects the truths of Either or and how to manage the confusing knot in IF THEN kind of conditionals ,

Sample questions

Directions :in the given questions , which of the statements are valid arguments

1. A. some workers are stupid. Some stupid are great Some workers are great.

B. Some men are dancers. All dancers are poets. Some men are poets.

C. Some boys are not studious . All studious are men. Some boys are men .

D. Either ram or Shyam attends college. Ram has gone to college. Shyam has gone for a movie.

2. A. Verma is a coaward. All moderls are coward. Verma is a model .

B. Some nets are monkeys. Rudolph is a monkey. Rudolph is a net .

C. Some snakes are posonous. Some poisonous are secrets. Some secrets are snakes.

D. All guns are wrenches. All wrenches are wicked. All guns are wicked.

3. A. No M is P. All R is M. All R is P

B. All A are wrong. No A is C . No C is wrong.

C. Some C are A. Most C are right. Most A are right.

D. No M is P. All R is M. No R is P

a. A b. B c. C and D d. D

4. A . Only Soldiers carry guns. Sam is a soldier. Sam is carrying a gun .

B. Only soldiers carry guns. Sam is carrying a gun. Sam is a soldier

C. All soldiers carry guns . Sam is carrying a gun . Sam is a soldier

D. All soldiers carry guns. Sam is a soldier . Sam is carrying a gun.

a. A b. B and D c. B and C d. A and B

5. A. Some toys are mad. Some mad are Crazy . No toys are crazy .

B. Some Clubs are hip. Some hip are cool. Some clubs are cool .

C. Some men are wise. Some wise are radioactive . Some men are radioactive.

D. All women are pretty. Some pretty are cool . Some women are cool .

a. B b. A and B c. C and D d. None of these.

Directions In Each question given Below, there are two statements followed by two conclusions numbered 1 and 2 . You have to decide which of the given conclusions logically follows from the staetements given. Your answers options are

a. If only Conclusion 1 follows

b. If only Conclusion 2 follows

c. If neither 1 nor 2 follows

d. If both 1 and 2 follow

6. Statements :

1. Some players are singers.

2. Some singers are tall.

Conclusions:

1. Some players are tall.

2. All players are tall

7. . Statements :

1. Some fools are intelligent.

2. Some intelligent are great.

Conclusions:

1. Some fools are great

2. All great are intelligent.

8. Statements

1. All umbrellas are airplanes

2. Some airplanes are bird

Conclusions.

1. Some umbrellas are birds.

2. Some birds are umbrellas

9. Statements

1. Some phones are watches

2. All watches are guns

Conclusions

1. All guns are watches.

2. Some guns are phones

10. Statements

1. All keys are locks

2. All locks are screws

Conclusions

1. All screws are keys

Some locks are keys.

Directions :Each question has a main statement followed by for sentences labeled as a. b. c. and d . Choose the ordered paier of statements where the the first statement implies the second and both statements arelogically consistent with the main statement.

11. I will get good grades only if i study

a. I did not get good grades

b. I studied

c. I did not study

d. I got good grades

1) bd 2)bc 3) cb 4) db

12. If we were meant to fly , we would have wings

a. we do not have wings

b. We are not meant to fly

c. We have wings

d. We are meant to fly

13. If i am not wise you are not a fool

a. I am wise

b. You are a fool

c. You are not a fool

d. I am not wise .

1)ab 2) ba 3) ac 4) ca

14. The dog will not bite unless you threaten it .

a. The dog bit

b. You threatened it

c. You did not threaten it

d. The dog did not bite.

1)ab 2)ba 3)ca 4)dc

15. If a defendant is guilty, he would not be smiling

a. THe defendant was smiling

b. The defendant was guilty

c. The defendant was not guilty

d. the defendant was not smiling

1)ac 2)ba 3)c 4)dc