The formula for the sum of an infinite geometric series, S = StartFraction a 1 Over 1 minus r EndFraction, may be used to convert 0. ModifyingAbove 2 3 with bar to a fraction. What are the values of a 1 and r? a 1 = StartFraction 23 Over 10 EndFraction, r = one-tenth a 1 = 23, r = StartFraction 1 Over 100 EndFraction a 1 = StartFraction 23 Over 100 EndFraction, r = 100 a 1 = StartFraction 23 Over 100 EndFraction, r = StartFraction 1 Over 100 EndFraction.