6. The Fibonnaci sequence starts off with the numbers 0 and I, then succeeding terms are the sum of its two immediate predecessors. Mathematically: f1 = 0, f2 =1 and fn = fn-1+fn-2, n = 3, 4,5. .... Test the assertion that the ratio fn-1/ fn of two suc- cessive values approaches the golden ratio (v5 - 1)/2 = 0.6180