Nth term of gp = a(1 - r^n)/(1 - r), where n∞ = 10, n = ∞, a = 2, r < 1 10 = 2(1 - r^∞)/(1 - r) 10 = 2/(1 - r) 1 - r = 2/10 = 1/5 r = 1 - 1/5 = 4/5 An infinite deometric series with a beginning value of 2 that converges to 10 has common ratio of 4/5.
