Find the infinite sum of 1/7 + 2/7^2 + 3/7^3 + 1/7^4 + 2/7^5 + 3/7^6 + ...
Find the infinite sum of 1/7 + 2/7^2 + 3/7^3 + 1/7^4 + 2/7^5 + 3/7^6 + ... == It converges to 11 / 57
