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wat is method of diffrence ??
plz explain how n where to use it ??
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
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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
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