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- 1. Sequences Thursday, January 29, 2015 A sequence is a list of numbers. There is usually some rule that connects these numbers. The numbers are sometimes called terms. For example: 3, 7, 11, 15… You add on 4 to get the next number (term) 1, 2, 4, 8, 16… You double to get the next number (term)
- 2. Try to write down the next three terms for each of these sequences and describe the rule. 2, 4, 6, 8… 1, 3, 5, 7… 4, 9, 14, 19… 6, 10, 14, 20 … 17, 15, 13, 11… 8, 15, 22, 29… 1, 2, 4, 7, 11… 1, 4, 9, 16… 2, 6, 10, 14… 2, 12, 22, 32… 1, 2, 3, 5, 8… 16, 8, 4, 2… 7, 10, 13, 16… 5, 11, 17, 23…
- 3. 2, 4, 6, 8, 10, 12, 14 (+2) 1, 3, 5, 7, 9. 11, 13 (+2) 9, 14, 19, 24, 29, 34 (+5) 14, 18, 22, 26, 30 (+4) 13, 11, 9, 7, 5 (- 2) 22, 29, 36, 43, 50 (+7) 7, 11, 16, 22, 29 (+ 0ne more than the previous) 16, 25, 36,49 (The square numbers) 10, 14, 18, 22, 26 (+4) 22, 32, 42, 52, 62 (+10) 13, 21, 34 ( Add the previous two terms) 4, 2, 1, ½ , ¼ (Halve) 13, 16, 19, 22, 25 (+3) 17, 23, 29, 35, 41 (+6)
- 4. Linear sequences A linear sequence is a name for a list of numbers where the next number is found by adding or subtracting a constant number. Here is an example:
- 5. 5, 8, +3
- 6. 5, 8, 11, +3 +3
- 7. 5, 8, 11, 14 +3 +3 +3
- 8. 5, 8, 11, 14, 17… +3 +3 +3 +3 etc
- 9. Finding the a rule for the nth term Position (n) 1 2 3 4 5 Value 5 8 11 14 17 This is a rule that connects a term’s position (n) with its value.
- 10. Find the nth rule for this sequence: 5, 8, 11, 14, 17… • Make a table with 5 columns and write the position of the terms 1st 2nd 3rd 4th etc as the n numbers in the first column n 1 2 3 4 5
- 11. Put the terms into the second column, 5, 8, 11, 14, 17… n Term 1 5 2 8 3 11 4 14 5 17 6
- 12. Find the difference between the terms 8 – 5 = 3 and write it in the third column n Term Difference 1 5 3 2 8 3 3 11 3 4 14 3 5 17 3 +3
- 13. Write the difference number multiplied by the n number in the fourth column n Term Difference 3n 1 5 3 3 2 8 3 6 3 11 3 9 4 14 3 12 5 17 3 15 +3
- 14. Write the difference between the value of 3n and the term in the fifth column n Term Difference 3n Term – 3n 1 5 3 3 2 2 8 3 6 2 3 11 3 9 2 4 14 3 12 2 5 17 3 15 2 The nth term rule = 3n + 2 +3

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