An infinite geometric series has first term 328 and a sum of 2296. What is its common ratio?
Sum = first term / (1 - r)
2296 = 328 / ( 1 - r )
2296 ( 1 - r) = 328
2296 - 2296r = 328
2296 - 328 = 2296 r
1968 = 2296 t
r = 1968 / 2296 = 6 / 7
