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

pllllls heeeeeeeeelp math 
Count Iblis,
It's trivial:
1/H_{n}  1/H_{n1} =
[H_{n1}  H_{n}]/[H_{n}H_{n1}] =
1/[n H_{n}H{n1}] 
pllllls heeeeeeeeelp math 
clavin,
please tell me answer also

pllllls heeeeeeeeelp math 
Stuck,
How do you proceed after that?

pllllls heeeeeeeeelp math 
Stuck,
In the image the equals sign is a typographical error

pllllls heeeeeeeeelp math 
Leon jaja,
thanks for the info..I've just got the answer..:)