pllllls heeeeeeeeelp math
posted by clavin .
visit this link and answer the question on screen
imageshack.us/photo/myimages/17/codecogseqn1.gif/

It's trivial:
1/H_{n}  1/H_{n1} =
[H_{n1}  H_{n}]/[H_{n}H_{n1}] =
1/[n H_{n}H{n1}] 
please tell me answer also

How do you proceed after that?

In the image the equals sign is a typographical error

thanks for the info..I've just got the answer..:)
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