11 Further Topics in Algebra 11.1 Sequences and Series 11.2 Arithmetic Sequences and Series 11.3 Geometric Sequences and Series Summary Exercises on Sequences and Series 11.4 The Binomial Theorem 11.5 Mathematical Induction Chapter 11 Quiz 11.6 Basics of Counting Theory 11.7 Basics of Probability The number of spirals on this sunflower, 34 to the right and 55 to the left, are two successive numbers in one of the most famous sequences in mathematics, the Fibonacci sequence: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, . . . . 1039
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