Find the sum of the first five terms of 2/3 + 8/9 + 26/27 + ...
2/3 + 8/9 + 26/27 + 80/81 + 242/243
= 5(1) - (1/3 + 1/9 + 1/27 + 1/81 + 1/243)
= 5 - 121/243
= 1094/243
+1223 
