Series in a series

Following series is given upto n terms:


It's sum up to n terms is defined by the formula:


( a,b,c,d are integer constants . )

What is a+b+2c+d?


Try splitting each term into a series. \((12-1)=?\) And \((1234-123)=?\).

Try finding formula upto n terms by summation (then deduce to the above equation) and then compare coefficients to the above equation and just sum to give the answer.


Problem Loading...

Note Loading...

Set Loading...