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Mohit Mittal Grade: 12
        

wat is method of diffrence ??


plz explain how n where to use it ??

7 years ago

Answers : (1)

Askiitians_Expert Yagyadutt
askIITians Faculty
74 Points
										

Hello mohit


 


Your question is exactly not clear to me..but then also i am attempting it...if you understand by this ..then i will feel happy..else make it a bit more clear please...


 


Some times a series is exactly in AP like..


 


1   3    5     7     9    11    13     15  ...............this is an AP with C.D = 2


 


But when


 


1    4    9   16   25...............................  then this is not an AP ....but when u see it clearly..then difference between two terms are in AP


 


1    4    9   16   25...............................


    3    5   7    9     .........................


 


So to solve such type of Question...we use this method...


 


S =  1    4    9   16   25...............................Tn 


 


S =        1    4    9   16   25.........................Tn-1  Tn


-----------------------------------------------------------------------


0  = (1  + 3 + 5 + 7+9 +........n terms ............) - Tn


 


Tn =  n^2


 


So once you find Tn ..then u can easily find out the sum ...by applying  sigma (Tn)  and apply limit as required


 


I hope this help you


 


Yagya


askiitians_expert

7 years ago
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