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![[Post New]](/templates/default/images/icon_minipost_new.gif) 23 Apr 2008 22:28:55 IST
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2/b=1/a +1 /c...............................................................1
2/c=1/b+1/d
so 1/c = 1/2b + 1/ 2d......................................................2
substitute in first equation and simplify
u get 3ad= 2bd +ab....................................................3
now simplify first equation also, their u get
2bd=cd+bc...................................................................4
then substitute in 3rd equation
now u get the answer
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