Finding the Value of a Series: Help with (h) and Power of r | Homework Question

  • Thread starter Michael_Light
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In summary, the formula for finding the value of a series is: S = a / (1-r). The value of "h" in a series can be found by using the formula: h = a * (1-r^n) / (1-r). The significance of "r" in finding the value of a series is that it determines the rate of increase or decrease in each term. The power of "r" is used in the formula to calculate the sum of the series and determine the missing term. There are special cases when finding the value of a series, such as a common ratio of 1 resulting in an infinite sum and a common ratio between -1 and 1 resulting in a finite sum.
  • #1
Michael_Light
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Homework Statement



Find the value of the following series: i need help with (h). Thanks...
DSC00555.jpg


Homework Equations





The Attempt at a Solution



I don't know which formula to use for this type of question (with power of r), can anyone enlighten me?
 
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  • #2
For the part of the summation involving 4r, use the partial sums of an arithmetic sequence.

For the part of the summation involving 3.2r, use the partial sums of a geometric sequence.
 

1. What is the formula for finding the value of a series?

The formula for finding the value of a series is: S = a / (1-r), where "a" represents the first term in the series, "r" represents the common ratio, and "S" represents the sum of the series.

2. How do you find the value of "h" in a series?

The value of "h" in a series can be found by using the formula: h = a * (1-r^n) / (1-r), where "a" represents the first term, "r" represents the common ratio, and "n" represents the number of terms in the series.

3. What is the significance of "r" in finding the value of a series?

"r" represents the common ratio in a geometric series and determines the rate at which each term in the series increases or decreases. It is a crucial component in calculating the value of the series.

4. How do you use the power of "r" in finding the value of a series?

The power of "r" is used in the formula for finding the value of a series (S = a / (1-r)) to calculate the sum of the series. It is also used in the formula for finding the value of "h" (h = a * (1-r^n) / (1-r)) to determine the value of the missing term in the series.

5. Are there any special cases when finding the value of a series?

Yes, there are some special cases when finding the value of a series. These include when the common ratio is equal to 1 (r = 1), which results in a series with an infinite sum, and when the common ratio is between -1 and 1 (-1 < r < 1), which results in a convergent series with a finite sum.

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