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What do you think is the common ratio in the following?
Example 1.3
3, 9, 27, 81, ...
Example 1.4
16, 8, 4, 2, 1, 0.5, ...
Of course, there are other more complicated sequences. What do you think is the
pattern for the sequences below?
Example 1.5
10, 8, 16, 14, 28, 26, ...
Example 1.6
0, 2, 6, 12, 20, 30, 42, ...
Example 1.7
3, 3, 4, 8, 10, 30, 33, ...


Exercise 1.1 Now can you come up with your own sequence? Show it to your
classmate and see if he or she can guess the pattern.