R] Consider the sum of a geometric progression... a + ar + ar2 + + arn'1 + ..., where a is the first term, the common ratio, r = second term/first term, is less than 1 and the sequence continues indefinitely. The sum of all the terms is given by a lim Sn: 12-06 1 7' After identifying the value of a, and calculating r, the common ratio, calculate sn. 2 + 4/3 +8/9 +