The Fibonaccit sequence Un} = 1, 1, 2, 3, 5, 8, 13, 2 1, ... is defined recursively by f1 = 1, f2 = 1, fn+2 = fn+l + fn for n = 1, 2, 3, .... Use complete induction to prove that  fn < 2n for all positive integers n.

Algebra & Trigonometry with Analytic Geometry
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ISBN:9781133382119
Author:Swokowski
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Chapter10: Sequences, Series, And Probability
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The Fibonaccit sequence Un} = 1, 1, 2, 3, 5, 8, 13, 2 1, ... is defined recursively by f1 = 1, f2 = 1, fn+2 = fn+l + fn for n = 1, 2, 3, ....

Use complete induction to prove that  fn < 2n for all positive integers n.

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