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Lesson Posted on 09/04/2018 Learn 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...
Lesson Posted on 20/06/2017 Learn Mathematical Reasoning
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. 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.
Lesson Posted on 06/02/2017 Learn Mathematical Reasoning
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 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
STATEMENTS
CONCLUSIONS
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
CONCLUSION
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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Asked on 09/11/2016 Learn Mathematical Reasoning
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