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Lesson Posted on 09 Apr IBPS CLERK/REASONING CBSE/Class 9/Mathematics Mathematical Reasoning

https://www.youtube.com/watch?v=vGKn1yuI9Iw&list=PLjriPhpnDXUANSMNcEaHM5um14EI2dtHO

Naresh Reddy

I have 12 years of experience in teaching mathematics and physical science, and arithmetic and reasoning...

https://www.youtube.com/watch?v=vGKn1yuI9Iw&list=PLjriPhpnDXUANSMNcEaHM5um14EI2dtHO
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Lesson Posted on 20/06/2017 Tuition/Class IX-X Tuition Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/Physics +1 Mathematical Reasoning less

A Physics And Math Problem

Ajinkya

Three small snails are each at a vertex of an equilateral triangle of side 60 cm. The first sets out towards the second, the second towards the third and the third towards the first, with a uniform speed of 5 cm/min. During their motion, each of them always heads towards its respective target snail.... read more

Three small snails are each at a vertex of an equilateral triangle of side 60 cm. The first sets out towards the second, the second towards the third and the third towards the first, with a uniform speed of 5 cm/min. During their motion, each of them always heads towards its respective target snail. How much time has passed, and what distance do the snails cover before they meet?

Answer: Resolve the velocity of snail 2 into a component pointing towards snail 1 and a component perpendicular to this. These two snails approach each other at a relative speed of v+V/2=3v/2=7.5cm/min, and therefore they meet after a time given by 60/7.5=8min.

They must all meet after this time and as they actually travel at a speed of 5 cm/min, they each cover a distance of 40 cm before doing so.

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Lesson Posted on 06/02/2017 Exam Coaching/Bank Clerical Exam Coaching Exam Coaching/CET Coaching Exam Coaching/IBPS Exam Coaching +2 Mathematical Reasoning Exam Coaching/NMAT Exam Coaching less

Syllogism Tricks

Ashish Vastri

I am teaching Maths since 4 years and I have taught from Basics to advance mathematics. I am an avid...

Syllogism Tricks Syllogism is a major part of reasoning in various competetive exams. It's simple but brain teaser too. Most of the students find it difficult to learn the concepts of venn diagram and apply accurately to questions. I would try to help you all with some useful concepts and tricks that... read more

Syllogism Tricks 

Syllogism is a major part of reasoning in various competetive exams. It's simple but brain teaser too. Most of the students find it difficult to learn the concepts of venn diagram and apply accurately to questions.

I would try to help you all with some useful concepts and tricks that you may apply in competitive exams.

All of these tricks will surely help you in Banking, Railways, SSC, NDA, MBA and many other exams.

All + All = All

All + No = No

All + Some = No conclusion 

Some + All = Some

Some + No = Some not

Some + Some = No conclusion 

No + All = Some not (Reversed) 

No + Some = Some not (Reversed )

No + No = No conclusion 

Note:

Some not/ Some Not Reversed + Anything = No conclusion 

To solve syllogism questions you may take help of two types of cancellation :

  • Cross Cancellation
  • Vertical Cancellation 

Cross Cancellation

STATEMENTS

  1.  All pens are Erasers
  2. All Erasers are Books
  3. No book is Table

CONCLUSIONS

  1. No Eraser is table 

All + No = No

All Erasers are books

No book is a Table

If we will cross cancel books, we get

CONCLUSION:    No Eraser is table .

Hence conclusion follows

Vertical Cancellation 

STATEMENTS 

  1. Some apples are fruits
  2. All bananas are fruits

CONCLUSION

  1. No banana is apple

 

All + Some = No conclusion 

Some apples are fruits

All bananas are fruits 

Here we can cancel fruits vertically but the direction of adding will get Reversed , i.e. Conclusion will be ALL + Some = No  conclusion 

Hence, Conclusion 1 doesn't follow.

There are more key points regarding Syllogism which I will post in next lesson.

 

 

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Answered on 19/11/2016 Tuition/Class XI-XII Tuition (PUC) Tuition/Class XI-XII Tuition (PUC)/Mathematics Mathematical Reasoning

Change the statement to negative statement: p - New Delhi is a city?

Manan Kenia

Internal Auditor, Financial Analyst

New Delhi is not a village.
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Answered on 19/11/2016 Tuition/Class XI-XII Tuition (PUC) Tuition/Class XI-XII Tuition (PUC)/Mathematics Mathematical Reasoning

Write the negation of the given statement: root 7 is a rational number?

Prateek Chandna

Assistant Professor

No, irrational.
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Answered on 07/12/2016 Tuition/Class XI-XII Tuition (PUC) Tuition/Class XI-XII Tuition (PUC)/Mathematics Mathematical Reasoning

What do you mean by compound statement with respect to mathematical reasoning?

Sreedevi A.

Teacher

When two simple statements are joined by using connectives like ^,V, implication,bi implication and negation a compound statement is formed.
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Answered on 08/12/2016 Tuition/Class XI-XII Tuition (PUC) Tuition/Class XI-XII Tuition (PUC)/Mathematics Mathematical Reasoning

Fill up a statement which having a relation: Window is to pane as book is to____?

Shreyans

Software Engineer

Cover.
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Answered on 28/11/2016 Tuition/Class XI-XII Tuition (PUC) Tuition/Class XI-XII Tuition (PUC)/Mathematics Mathematical Reasoning

What number should come next in the given series: 2, 1, (1 / 2), (1 / 4), …. ?

Tapas Bhattacharya

Tutor

1/8
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Asked on 09/11/2016 Tuition/Class XI-XII Tuition (PUC) Tuition/Class XI-XII Tuition (PUC)/Mathematics Mathematical Reasoning

Check whether the given sentence is statement: 8 is less than 6?

Answer

Asked on 09/11/2016 Tuition/Class XI-XII Tuition (PUC) Tuition/Class XI-XII Tuition (PUC)/Mathematics Mathematical Reasoning

Define Validating Statement?

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