A train travelling at 25 km/hr leaves Kolkata at 10 a.m. and another train travelling 35 km/hr leaves at 3 p.m. from Kolkata in same direction.
They will be together at a distance of: ??
Shortcut Formul...
Two persons, say P and Q, move in opposite direction after starting at the same time. P takes x hrs to reach starting point of Q, and Q takes y hrs to reach P's starting point. Then ...
Sample SQL questions to be attempted in technical interviews. A must read for the engineering/computer application students appearing for IT interview...
Suppose average marks obtained by 80 student is 40.
Average marks of passed candidates is 45 and that of failed candidates is 15.
Calculate no. of candidates who have passed or failed?
Shortcut Formula:...
Best book to brush C concepts before Interview.
Contains Questions asked in interviews of International Companies.
All the questions are neatly answered with examples.
Contains tested & working code samples — not just Theory.
Light weight ebook, contains 50 pages only. ...
Suppose the original population of a city is P. If the annual rate of increase/decrease is constant say r%. then the population in n years will be: ...
Suppose X units of an item is available. p% is added to it first. Then q% of the increased quantity is added. Again r% of the increased quantity is added.
If the current amount becomes Y unit then, initial amount X is calculated using the following relation:...
The least number which is exactly divisible by each one of the given numbers.
Least Commmon Multiple(L.C.M) can be calculated by any of the following method...
H.C.F of two or more numbers is the greatest number that can exactly divide each one of the number. It is also known as Greatest Common Divisor (G.C.D.).
Example:
Consider the two numbers 4,16.
The numbers that can divide 4 and 16 are 2,4.
Here 4 is the highest number that can exactly divide both 4 and 16 , so 4 is the HCF of 4,16.
H.C.F can be calculated by any of the following method...
A series is in Geometric Progression (G.P.), if it has the following form:
a, ar, ar2, ar3,ar4 ....
where a=First term and r=Common ratio.
Some useful derivations from A.P. Serie...
A series is in Arithmetic Progression (A.P.), if it has the following form:
a, a+d, a+2d, a+3d, ....
where a=First term and d=Common difference.
Some useful derivations from A.P. Serie...
if the difference between the sum of the digits at odd places and the the sum of the digits at even places is either 0 or any number divisible by 11.
Example:
49245317 is divisible by 11 since (4+2+5+1)-(9+4+3+7)=-11 which is divisible by 11.
125943 is not divisib...
Only when the sum of the digits is divisible by 9.
Example:
45936 is divisible since 4+5+9+3+6=27 is divisible by 9
45901 is not since 4+5+9+0+1=19 is not divisible by...
A number is divisible by 8 if the number formed by hundred's ten's and one's place of the number is divisible by 8.
Example:
12398344 is divisible by 8 since the last three digits 344 is divisible by 8.
290125 is not divisible by 8 since the last three digits 125 is not divisible by...
Number is divisible by 4 if the sum of its lat two digit is divisible by 4.
Example:
125756 is divisible by 4 since the last two digit 56 is divisible by 4.
12345 is not divisible by 4 since 45 is not divisible by...
Only when the sum of the digits is divisible by 3.
Example:
24579 is divisible by 3. Since 2+4+5+7+9=27 which is divisible by 3.
13001 is not divisible by 3. Since 1+3+0+0+1=5 which is not divisible by...
How Linux Works: What Every Superuser Should Know
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Book Details
* Paperback: 368 pages
* Publisher: No Starch Press (May, 2004)
* Language: English
* ISBN-10: 9781593270353
* ISBN-13: 978-1593270353
*Dow...