Solving the Problem: ∑_(k=100)^200▒〖k^3〗

  • Thread starter Dlak1992
  • Start date
In summary, The formula for solving ∑(k=100)^200 k^3 is (200^2 * (200+1)^2) / 4 - (99^2 * (99+1)^2) / 4. To solve this problem, you can use the formula for the sum of consecutive cubes: ∑(k=1)^n k^3 = (n^2 * (n+1)^2) / 4. Yes, this problem can be solved without using a formula by breaking it down into smaller parts and using basic arithmetic. This type of problem has real-life applications in fields such as mathematics, physics, and engineering. For example, it can be used to calculate the total work
  • #1
Dlak1992
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0
So, I am doing my HW, got everything done except for 1 problem. I have been stuck looking for an example of how to do this, but my book does not have any examples.

The problem is: ∑_(k=100)^200▒〖k^3〗

If someone does not understand it, it is.

200 is on top of the sigma
K=100 on the bottom
and k^3 to the right.
 
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  • #2
Welcome to PF!

Hi Dlak1992! Welcome to PF! :smile:

(try using the X2 and X2 icons just above the Reply box :wink:)

You may find it easier to do ∑k=100200 k(k-1)(k-2) first. :wink:
 

1. What is the formula for solving ∑_(k=100)^200▒〖k^3〗?

The formula for solving this problem is: ∑(k=100)^200 k^3 = (200^2 * (200+1)^2) / 4 - (99^2 * (99+1)^2) / 4.

2. How do you approach solving this problem?

To solve this problem, you can use the formula for the sum of consecutive cubes: ∑(k=1)^n k^3 = (n^2 * (n+1)^2) / 4. You can then plug in the values for n=200 and n=99 and subtract the two values to get the final answer.

3. Can this problem be solved without using a formula?

Yes, it is possible to solve this problem without using a formula. One approach is to break down the sum into smaller, more manageable parts. For example, you can group the terms into (100^3 + 101^3 + 102^3) + (103^3 + 104^3 + 105^3) + ... + (199^3 + 200^3). From there, you can use basic arithmetic to find the sum of each group and then add them together to get the final answer.

4. Are there any real-life applications for solving this type of problem?

Yes, this type of problem can be found in various fields such as mathematics, physics, and engineering. For example, calculating the sum of consecutive cubes can be used in physics to determine the total work done by a variable force over a certain distance.

5. Can you provide an example of using this formula in a real-life scenario?

Sure, let's say you want to calculate the total cost of renting a car for a certain number of days. The daily rental rate is $50, and you want to rent the car for 10 days. Using the formula for the sum of consecutive cubes, you can find the total cost as follows: ∑(k=1)^10 50k = (10^2 * (10+1)^2) / 4 = $2,750. So, the total cost of renting the car for 10 days would be $2,750.

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