Find a formula that generates a sequence

In summary, a formula that generates a sequence is an equation or set of rules used to generate a series of numbers in a specific pattern. Finding a formula for a sequence is important as it helps identify patterns and relationships between numbers, making it easier to predict future values and perform calculations. Some common types of sequences include arithmetic, geometric, and Fibonacci sequences. To find a formula for a sequence, one must first identify the pattern or relationship between the numbers and then use algebraic techniques to create a formula. However, not every sequence can be generated by a formula as some may not follow a specific pattern or relationship. Additionally, different formulas can generate the same sequence.
  • #1
nicnicman
136
0

Homework Statement



Find a formula that generates the sequence:

2/(3 x 4), -3/(4 x 5), 4/(5 x 6), -5/(6 x 7), . . .

Homework Equations


The Attempt at a Solution



Here is what I have so far:

a_n = -1(n/((n + 1)(n + 2)))

Now, I'm stuck. The formula generates a negative number every time. I need a negative number every other time.
Any suggestions?
 
Last edited:
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  • #2
Use something like (-1)^n?
 
  • #3
Yeah, that will work. Thanks!
 

Related to Find a formula that generates a sequence

What is a formula that generates a sequence?

A formula that generates a sequence is an equation or set of rules that can be used to generate a series of numbers in a specific pattern or order.

Why is it important to find a formula that generates a sequence?

Finding a formula that generates a sequence can help identify patterns and relationships between numbers, making it easier to predict future values and make calculations.

What are some common types of sequences?

Some common types of sequences include arithmetic sequences (where each term is a constant value added or subtracted from the previous term), geometric sequences (where each term is multiplied by a constant value to get the next term), and Fibonacci sequences (where each term is the sum of the two previous terms).

How do you find a formula that generates a sequence?

To find a formula that generates a sequence, you first need to identify the pattern or relationship between the numbers in the sequence. This can be done by looking at the differences between terms, the ratio between terms, or any other noticeable patterns. Once the pattern is identified, you can use algebraic techniques to create a formula that represents the sequence.

Can a formula generate any sequence?

No, a formula may not be able to generate every possible sequence. Some sequences may not follow a specific pattern or relationship that can be represented by a formula. It is also possible for different formulas to generate the same sequence, as there can be multiple ways to represent a pattern in mathematical terms.

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