Write the indicated sum in sigma notation:

1-(1/2)+(1/3)-(1/4)+...-(1/100)

Another one using Special Sum Formulas

nEi=1 (2i-3)^2

I wanted to break it up but the square is throwing me off :(

btw the n is on top of the E and i=2 is below it.

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- Jun 22nd 2006, 02:08 PMpakmanSigma Notation
Write the indicated sum in sigma notation:

1-(1/2)+(1/3)-(1/4)+...-(1/100)

Another one using Special Sum Formulas

nEi=1 (2i-3)^2

I wanted to break it up but the square is throwing me off :(

btw the n is on top of the E and i=2 is below it. - Jun 22nd 2006, 02:14 PMThePerfectHackerQuote:

Originally Posted by**pakman**

Thus,

- Jun 22nd 2006, 02:17 PMpakman
Thanks but it still makes no sense to me :(

- Jun 22nd 2006, 02:19 PMThePerfectHackerQuote:

Originally Posted by**pakman**

- Jun 22nd 2006, 02:22 PMpakmanQuote:

Originally Posted by**ThePerfectHacker**

- Jun 22nd 2006, 02:34 PMThePerfectHackerQuote:

Originally Posted by**pakman**

- Jun 22nd 2006, 02:39 PMpakmanQuote:

Originally Posted by**ThePerfectHacker**

- Jun 22nd 2006, 02:50 PMThePerfectHackerQuote:

Originally Posted by**pakman**

---> first term good

---> second term good

---> thrid term good.

And so on - Jun 22nd 2006, 03:08 PMpakmanQuote:

Originally Posted by**ThePerfectHacker**

- Jun 22nd 2006, 03:21 PMpakman
You wouldn't by chance know how to solve the second problem using a Special Sum Formula?

- Jun 22nd 2006, 04:13 PMpakman
Nevermind I figured it out. Square it out to 4i^2-12i+9 and just break it up from there :D

- Jun 22nd 2006, 07:51 PMSoroban
Hello, pakman!

Quote:

Another one using Special Sum Formulas:

. .

I'm only guessing, but are these the Special Sum Formulas?

. .

We have: .

. . Then: . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. .

which simplifies to: .