4 (5 pts) Let F. be the n-th Fibonacci number. Use strong induction to prove the following: F. 31.7F-1 > 4 Base cases: Show true for n = 4 and 5: n = 4: Ihs = F = rhs =1.7F3 = n = 5: Ths rhs = Inductive case: Assume true for 4 Snsk, k Show true for n = k + 1: 5 Why do we need to start with n = 4