S Starz31 New member Dec 12, 2009 #1 10)Find the sum, if it exists, for the infinite geometric sequence. 5,-5 /3, 5/9, ... A) 10/3 B)-5/3 C)Does not exist D) 15/4
10)Find the sum, if it exists, for the infinite geometric sequence. 5,-5 /3, 5/9, ... A) 10/3 B)-5/3 C)Does not exist D) 15/4
J Joe New member Dec 12, 2009 #2 The formula for an infinite geometric series is S = a/(1 - r) where |r| < 1. Here the common ratio is -1/3 and the first term, a, is 5. So S = 5/(1 + 1/3).
The formula for an infinite geometric series is S = a/(1 - r) where |r| < 1. Here the common ratio is -1/3 and the first term, a, is 5. So S = 5/(1 + 1/3).
