ans is n(n+1)/2+(6+n)/2+(1-n)/2n
rate me if my ans is correct.....
Sorry,but thats the wrong answer.
The correct ans is
by generalising we can do....since if n=2 it is 4
if n=3 S=9..so we can take it as n2
i ll post soon the correct sol....
No ans is
I am not sure if this is the correct method but you can try.
I will try to post the complete solution within 2 days.
Then, the required sum
Multiplying with and subtracting from , we obtain
Since , we get
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