http://webwork.math.ttu.edu/webwork2...3a458d3af1.png

(a) The series http://webwork.math.ttu.edu/webwork2...eae9099031.png = ?

b) The sequence http://webwork.math.ttu.edu/webwork2...ff7aab44e1.png = ?

I have done the rest of the problems with out any problem.. but i cant seem to get this one right.

Please help,

Thank you