Find the sum of the first seven terms: 1/2 + 1 + 2 +4 +...
7.5
63.5
55.5
31.5
The common ratio is 2....so....
Sum = first term [ 1 - common ratio^7 ] / [ 1 - common ratio ] =
(1/2) [ 1 - 2^7 ] / [ 1 - 2 ] =
(1/2) [ -127] / [ -1] =
(1/2) (127) =
+511 
