Math Is Fun Forum

krassi_holmz

Real Member

Registered: 2005-12-02

Posts: 1,905

Master Sum

Find the sum:

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IPBLE:  Increasing Performance By Lowering Expectations.

krassi_holmz

Real Member

Registered: 2005-12-02

Posts: 1,905

Re: Master Sum

Good question.
I want YOU to sweat a little.

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IPBLE:  Increasing Performance By Lowering Expectations.

Ricky

Moderator

Registered: 2005-12-04

Posts: 3,791

Re: Master Sum

I seem to be getting:

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"In the real world, this would be a problem.  But in mathematics, we can just define a place where this problem doesn't exist.  So we'll go ahead and do that now..."

krassi_holmz

Real Member

Registered: 2005-12-02

Posts: 1,905

Re: Master Sum

Good.
How?

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IPBLE:  Increasing Performance By Lowering Expectations.

George,Y

Member

Registered: 2006-03-12

Posts: 1,379

Re: Master Sum

I used to think it hard. But as I put entries on paper, it's easier than I thought. for i=4

traditionally, multiply above by 2 and see
       

this expression should be substracted but 2^2-1^2 and 3^2-2^2 are the special pattern in lefted.

use a formula:

what should be substracted next are expressions below:

next problem is to find:

I know how to solve it, but I would like to leave it to next volunteer

Last edited by George,Y (2006-06-11 01:42:47)

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X'(y-Xβ)=0