(In reply to
The solution was given by Peter)
Looking at Chesca's proposed official solution, I can see that the intention of the question is not what was stated in the question. What Chesca really wanted was the sum of that infinite series, with the a(k) as the terms. Kurious' original post did indeed find that value and used its existence as proof that the terms went to zero.
The proposed official solution is the value for the sum of the terms that Kurious found.

Posted by Charlie
on 20080208 11:04:37 