If a and d are two complex numbers, then the sum to (n+1) terms of the following series is
na
0
None of these
We can write terms
Again,
Differentiating with respect to x,
Putting x =1 in (ii) and (iii), we get
and
Thus the required sum to (n+1) terms, by (i)
=a.0 + d.0 = 0.
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