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Examples: {1, 2, 3, 4.} is a very simple sequence (and it is an infinite sequence) {20, 25, 30, 35.} is also an infinite sequence {1, 3, 5, 7} is the sequence of the first 4 odd numbers (and is a finite sequence) {4, 3.
Sequences. You can read a gentle introduction to Sequences in Common Number Patterns. What is a Sequence? A Sequence is a list of things (usually numbers) that are in order. Infinite or Finite. When the sequence goes on forever it is called an infinite sequence,otherwise it is a finite sequence.
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Examples: {1, 2, 3, 4, ..} is a very simple sequence (and it is an infinite sequence){2. In Order. When we say the terms are "in order", we are free to define what order that is! They could go forwards, backwards .. Like a Set. A Sequence is like a Set, except: the terms are in order (with Sets the order does not matter)the same value can appear many times (only once in Sets)Example: {0, 1, 0, 1, 0, 1, ..} is the sequence of alternating 0s and 1s.
The set is just {0,1}Notation. Sequences also use the same notation as sets: list each element, separated by a comma, and then put curly brackets around the whole thing.{3, 5, 7, ..}The curly brackets { } are sometimes called "set brackets" or "braces". A Rule. A Sequence usually has a Rule, which is a way to find the value of each term. Example: the sequence {3, 5, 7, 9, ..} starts at 3 and jumps 2 every time: As a Formula.
Saying "starts at 3 and jumps 2 every time" is fine, but it doesn't help us calculate the: 1. So, we want a formula with "n" in it (where n is any term number). So, What Can A Rule For {3, 5, 7, 9, ..} Be? Firstly, we can see the sequence goes up 2 every time, so we can guess that a Rule is something like "2 times n" (where "n" is the term number). Let's test it out: Test Rule: 2nn. Term. Test Rule. 13.
That nearly worked .. Test Rule: 2n+1n.
Term Test Rule. 13. That Works! So instead of saying "starts at 3 and jumps 2 every time" we write this: 2n+1. Now we can calculate, for example, the 1. Many Rules. But mathematics is so powerful we can find more than one Rule that works for any sequence.
Example: the sequence {3, 5, 7, 9, ..}We have just shown a Rule for {3, 5, 7, 9, ..} is: 2n+1. And so we get: {3, 5, 7, 9, 1. But can we find another rule? How about "odd numbers without a 1 in them": And we get: {3, 5, 7, 9, 2. A completely different sequence! And we could find more rules that match {3, 5, 7, 9, ..}. Really we could. So it is best to say "A Rule" rather then "The Rule" (unless we know it is the right Rule).
Notation. To make it easier to use rules, we often use this special style: Example: to mention the "5th term" we write: x. So a rule for {3, 5, 7, 9, ..} can be written as an equation like this: xn = 2n+1. And to calculate the 1. Can you calculate x. Here is another example: Example: Calculate the first 4 terms of this sequence: {an} = { (- 1/n)n }Calculations: a. Answer: {an} = { - 1, 1/4, - 1/2. Special Sequences.
Now let's look at some special sequences, and their rules. Arithmetic Sequences. In an Arithmetic Sequencethe difference between one term and the next is a constant.
In other words, we just add some value each time .. Example: 1, 4, 7, 1. This sequence has a difference of 3 between each number. Its Rule is xn = 3n- 2.
In General we can write an arithmetic sequence like this: {a, a+d, a+2d, a+3d, .. And we can make the rule: xn = a + d(n- 1)(We use "n- 1" because d is not used in the 1st term). Geometric Sequences. In a Geometric Sequence each term is found by multiplying the previous term by a constant. Example: 2, 4, 8, 1.
This sequence has a factor of 2 between each number. Its Rule is xn = 2n. In General we can write a geometric sequence like this: {a, ar, ar. Note: r should not be 0. When r=0, we get the sequence {a,0,0..} which is not geometric. And the rule is: xn = ar(n- 1)(We use "n- 1" because ar.
Triangular Numbers 1, 3, 6, 1. The Triangular Number Sequence is generated from a pattern of dots which form a. By adding another row of dots and counting all the dots we can find. But it is easier to use this Rule: xn = n(n+1)/2.
Example: the 5th Triangular Number is x. Square Numbers 1, 4, 9, 1. The next number is made by squaring where it is in the pattern. Rule is xn = n. 2Cube Numbers 1, 8, 2. The next number is made by cubing where it is in the pattern. Rule is xn = n. 3Fibonacci Sequence This is the Fibonacci Sequence.
The next number is found by adding the two numbers before it together: The 2 is found by adding the two numbers before it (1+1) The 2. Rule is xn = xn- 1 + xn- 2. That rule is interesting because it depends on the values of the previous two terms. Rules like that are called recursive formulas. The Fibonacci Sequence is numbered from 0 onwards like this: n =0. Example: term "6" is calculated like this: x. Series and Partial Sums.
Now you know about sequences, the next thing to learn about is how to sum them up. Read our page on Partial Sums. When we sum up just part of a sequence it is called a Partial Sum. But a sum of an infinite sequence it is called a "Series" (it sounds like another name for sequence, but it is actually a sum). See Infinite Series. Example: Odd numbers.
Sequence: {1, 3, 5, 7, ..}Series: 1 + 3 + 5 + 7 + .. Partial Sum of first 3 terms: 1 + 3 + 5.