This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori 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.