CAT/XAT/CMAT Essential Concepts!!!

MBA CAT 2024
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Hello puys & pirls!!!welcome to this new & unique thread. Share what you know and ask what you don't know...help each other by sharing any good damn concept/shortcut you have came across from your prep till now.Ask your friends to join and lets make it big. you can share & ask anything from QA/VA/LR...lets hear it and make it a new platform for your daily knowledge boosting.

Warning: Plz don't post your mock scores/institute query etc...let it be clean for its essential purpose. ONLY CONCEPTS..& WE NEEDD itt...u know that.

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"knowing is not enough...willing is not enough....you must do it"  who said this?

"and to do something...you must share"


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So my first share is..... a small but important tips.

Whenever you get a que of HCF and LCM....always do a background check if the HCF is a factor of LCM.....we have a tendency to jump right in to the que....got a question in PG itself...

do it yourself.

HCF and LCM of two nos are 75 and 864....if one of the nos is 240..whats the other one?

normally we would do like this...  (75x864)/240    =  270

but you will be wrong...cz the HCF 75 is not a factor of LCM 864...

so ans will be data inadequate..or none.

there will be options wid 270 too...which normally people will tick...

smal tip...isn't it?   ....y not share your small tips too....

thanx.

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What's the usage of "in " and "on" preposition. Sometimes it's used as "in a boat" and sometimes "on a boat". Also if anyone can summarize the usages of "in" , "on" and "at" will be quite helpful..

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inhalable matlab

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Time and distance ... Always Remember which one is constant and do the sum ...Tricks lies in that only ...

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http://s12.postimg.org/lcrgd5399/image.jpg

If the soldier did not stop anywhere in between leaving and rejoining his position what is the ratio of the soldier's speed to that of the column?

a. 1 + sqrt(2): 

 b. 2: 1

c. 3: 1     

d. 4 - sqrt(2): 1

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Fact/inference/judgement.

http://totalgadha.com/mod/forum/discuss.php?d=214

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In remainder -LCM-HCF problems... you get 3 types of problems...  

1.  same remainder    so, N= LCM(divisors)+the remainder

2. Common Diff between divisors and remainders (CD), so N= LCM( Divisors) x K - Common diff

3. no same remainder and no common diff.    you need to take all the equations formed then solve them.

tip:  but some questions sometimes comes in a bit tricky conditions...you may get to see that no common diff is there..but usually in these questions if you multiply all the equation by some common no you get the standard equations which will show you common differences......  so always suspect a que from this category if it can be arranged in some way to make it fall under the 2nd category.

eg:

If n is the smallest number which when divided by 3, 5, 7 and 9 leave a remainder of 1, 2, 3 and 4 respectively, find the product of the digits of n.

solution: 

n will be of the form:

n = 3a + 1                                                 n = 5b + 2              n = 7c + 3              n = 9d + 4

Multiplying each of the equations by 2,

2n = 6a + 2 = 3A + 2      2n = 10b + 4 = 5B + 4

2n = 14c + 6 = 7C + 6     2n = 18d + 8 = 9D + 8

This means that when 2n is divided by 3, 5, 7 and 9, the remainders are 2, 4, 6 and 8 respectively. This is a standard problem with difference between divisors and remainders being 1.

So, smallest value of 2n = LCM (3, 5, 7, 9) - 1 = 315 - 1 i.e. 314 and the smallest value of n is 157. The product of the digits is 35.

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pls explain the concept of mod that we use in finding remainder

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do we have a link which explains finding max/ min of an expression using am>=gm

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maximum and minimum value in set theory. Any good video or pdf for that?? 

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What are all the Types of Analogies to easily find the relation between the words and then to find the answer.? i .e. Group of,Part Of, Made of, Opposite, Type of etc.