The Fibonacci numbers are defined in Section 5.1 by fo = 0, f1 =1, fn = fn-1+ fn-2 if n > 2. Show that DO 1 1 1 1 (a) In - 1in+1 In - 1in Infatl' ( b ) E fn-1fn+1 = 1, ( c ) In = 2. n=2 n-2 fn-1in+1