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permutation and combination

by Nitish Mittal -

find the number of ways in which 5 letters can be put in the 6 envelopes such that no letter goes into the correct envelope . how the answer will be changed if number of envelopes is changed to 5.

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kinematics

by siddharth bhardwaj -

PLEASE TELL ME THE DETAILED SOLUTION OF THE FOLLOWING QUESTION:

 

 

A engineer works at a factory out of town . A car is sent for him from the factory  everyday that arrives at the railway station at the same time as the  train he takes .one day the engineer arrived at the station one hour before his usual time, and without waiting for the car ,started walking towards factory site. On his way he met the car and reached the factory 10 minutes before the usual time how long did the engineer walk before he met the car ?

 

a)40 minutes.

b)45 minutes.

c)50 minutes.

d)55 minutes.

 

"i have tried to do this question by graphical method but was unable to find any answer"

 

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Degree of Unsaturation

by Prashanth S -

What exactly is degree of unsaturation and ho do u calculate it for any organic compound for eg : find  D.U of acetaldehyde

Is there any specific formula to calculate D.U

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PERM AND COMB

by aditya gopi -
5 GIRLS AND 12 BOYS SIT AT RANDOM IN A ROW HAVING 17 CHAIRS NUMBERED AS 1 TO 17,THEN THE NUMBER OF WAYS IN WHICH THEY CAN SIT SO THAT THE END SEATS ARE OCCUPIED BY THE GIRLS AND BETWEEN ANY 2 GIRLS ODD NUMBER OF BOYS SIT.

(A) 17 X 12!
(B) 5 X 12!
(C) 12! X 5!
(D) 35 X 12! X 5!
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A general problem

by Nitish Mittal -

I often find it difficult to solve the questions of Physics in which calculus is used. By reading the question, I cannot make it out that whether use of calculus is there or not. Can somebody help me? I am aspirant of JEE 2007

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physics

by abhinav chandra -

A uniform rod pivoted at its upper end hangs vertically. it is displaced through an angle of 60* and then released. find the magnitude of the force acting on a particle of mass dm at the tip of the rod when the rod makes an angle of 37* with the vertical

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physics

by abhinav chandra -
A hollow sphere is released from the top of an inclined plane of inclination 30 (a)what should be the minimum co-efficient of friction between the sphere and the plane to prevent it from sliding?
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COMPLEX NUMBERS

by aditya gopi -
The greatest and the least values of |z1 + z2| if z1 = 12+9i and |z2| = 7 are respectively?

(a) 22 and 8
(b) 20 and 8
(c) 22 and 10
(d) 25 and 8

Please give me the answer in detail.
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