This week's giveaway is in the Android forum. We're giving away four copies of Android Security Essentials Live Lessons and have Godfrey Nolan on-line! See this thread for details.

I have the error of " not a statement " for the line in which I applied the formula for summation. The formula given is (n-m+1)(n+m) /2 , where m is the starting number and n is the last number.