I have uploaded my question in the attachment here which is called proofs - please have a look and let me know if u know the answer - I need it really urgently.

Thanks,

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- Sep 5th 2012, 07:20 AMhomalinasummation and weights problem - proof
I have uploaded my question in the attachment here which is called proofs - please have a look and let me know if u know the answer - I need it really urgently.

Thanks, - Sep 10th 2012, 02:29 AMchiroRe: summation and weights problem - proof
Hey homalina.

Can you show what you have tried already? What you are thinking? You need to make an attempt yourself before you get specific advice and suggestions. - Sep 10th 2012, 04:32 AMhomalinaRe: summation and weights problem - proof
Attachment 24762 - This is what I have done for the first part - and for the second part I know that I am supposed to square the whole of the second part of the question and then I will get 1/the exact denominator of the second part of the question but I am not sure if thats correct and the third part I just dont have a clue...

Thanks!