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Discrete Mathematics Section 1.2

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Discrete Mathematics Section 1.2

Number Puzzles and Sequences

- 1, 3, 5, 7, 9, _____
- 1, 4, 9, 16, 25, 36, ______

- 1, 3, 5, 7, 9, _____
- 1, 4, 9, 16, 25, 36, ______
Finding a pattern means one of these three things:

- Each term is related (by mathematical operations) to previous terms.
- Each term can be described relative to its position in the sequence.
- The sequence merely enumerates a set of integers that the reader may recognize.

- 1, 3, 5, 7, 9, _____
- 1, 4, 9, 16, 25, 36, ______
Finding a pattern means one of these three things:

- Each term is related (by mathematical operations) to previous terms.
- Each term can be described relative to its position in the sequence.
- The sequence merely enumerates a set of integers that the reader may recognize.

- 1, 3, 5, 7, 9, _____
- 1, 4, 9, 16, 25, 36, ______
Finding a pattern means one of these three things:

- Each term is related (by mathematical operations) to previous terms. (recursive formula)
- Each term can be described relative to its position in the sequence. (closed formula)
- The sequence merely enumerates a set of integers that the reader may recognize.

- A recursive formula for a sequence is a formula where each term is described in relation to a previous term (or terms) of the sequence. This type of description must include enough information on how the list begins to determine every subsequent term in the list.
- A closed formula for a sequence is a formula where each term is described only in relation to position in the list.
- We can also describe a sequence in terms of recognition (i.e., the odd positive integers). This is by far the least meaningful description.