Statement. Let {F} be the sequence defined by the recursive definition Fn Fo= 0 and F₁ = 1. Then for all n E Zzo, Fn is even. Proof. Let P(n) be the statement that Fn is even. Base Case: Since Fo= 0, and 0 is even, P(0) is true. = Fn-1 + Fn-2 Induction Step: Suppose that P(0), P(1),..., P(k) is true for some k ≥ 0; that is, Fo, F₁,...,. each even. We will show that P(k + 1) is true; that is, Fk+1 is even. FkFk-1. Since P(k) and P(k − 1) are both true, F = 2l and F-1 = 2r for some integers and r. By the recurrence relation, Fk+1 F-1 are both even. So by definition, F = 2l + 2r = = 2(l+r). Since l and r are integers, l + r is an integer, and by definition, F Fk+1 also even. Thus, by the Principle of Induction, the statement is true. (a) Do you believe the statement is true? If so why? If not, give an examlpe to show why not. (b) There is something wrong with the proof. EXPLAIN what it is. (c) What kind of induction is being used? Strong or weak? How do you know?

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