AoPS Wiki talk:Problem of the Day/July 7, 2011
Problem
AoPSWiki:Problem of the Day/July 7, 2011
Solution
This Problem of the Day needs a solution. If you have a solution for it, please help us out by adding it.
The -th term in the sequence is . By using basic summation properties, and the formula for the sum of a geometric sequence, the desired sum is:
.