www.nickzom.com has made it very possible for anyone to solve either arithmetic or geometric progression online without any stress. All you need to do is to enter your values and click on REPORT.
You can solve for any parameter at all on www.nickzom.com and you get your answer with the steps of how the answer was got. It's all online.

To access this operation:

Log in to www.nickzom.com
Click on Mathematics below World of Calculations
Click on the one you want to solve either Arithmetic Progression or Geometric Progression
Click on the parameter you want to find
Key in your values
Click on Report and it all comes down for YOU
THAT'S ALL

Thanks!