@@randerson112358 at 3:45 the equation is ((n-2)(n-1))/2 x (2n+1) then in the next step you put everything under the same denominator. I am saying that in the next step I believe you had to multiply by 2 in order to put everything under the same denominator.
I think you are confused on the multiplication for example a * b/2 = (a * b)/2. Let a=4 and b=2, then 4 * 2/2 = 4 and (4 * 2)/2 = 8/2 = 4. I think you are thinking of addition a/2 + b doesn't equal (a + b)/2.
You did such a great job! Really helping me in my first week of an Algorithms 1 class!
More of these please!
You made this so clear! Thanks for this video :)
Can anyone please explain the property used at 1:59
Unreal, thank you!
Is there one of these on summation by parts?
I have many videos on Summations, here is a playlist below:
ua-cam.com/video/hXeb8cM5o_0/v-deo.html
I have many videos on Summations, here is a playlist below:
ua-cam.com/video/hXeb8cM5o_0/v-deo.html
Thanks, your videos really help!
Thanks I'm glad they are helpful !
shouldn't you multiply (2n+1) by 2 since you're now putting a 2 denominator on it? Therefore the answer would look like ((n-2)(n-1)(4n+2))/2
I am sorry I do not understand your question, could you elaborate ?
@@randerson112358 at 3:45 the equation is ((n-2)(n-1))/2 x (2n+1)
then in the next step you put everything under the same denominator.
I am saying that in the next step I believe you had to multiply by 2 in order to put everything under the same denominator.
I think you are confused on the multiplication for example a * b/2 = (a * b)/2.
Let a=4 and b=2, then 4 * 2/2 = 4 and (4 * 2)/2 = 8/2 = 4.
I think you are thinking of addition a/2 + b doesn't equal (a + b)/2.
@@randerson112358 you're right, thanks for the reply!
Excellent video
Very good video!
Thank you so much
You are welcome Ms. Sara
what does closed form mean?
It's a mathematical expression that can be evaluated in a finite number of operations.
I think the correct answer is (2n^3-5n^2-n+1)/2, no?
No, the answer in the video is correct.
Yep, I saw that later. My bad!
Good job! =D
nicely explained!