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![[Post New]](/templates/default/images/icon_minipost_new.gif) 23 Apr 2008 21:00:31 IST
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is a,b,c,d are in hp prove dat ab + bc + cd =3ad
pls solve
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i can feel the light betray me...............
not a single second left.......... |
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23 Apr 2008 21:21:52 IST
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2/b=1/a+1/c 2/c=1/b+1/d 2/b=a+c/ac 2/c=b+d/bd
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23 Apr 2008 21:24:37 IST
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now substitute da values of b nd c.
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23 Apr 2008 22:09:05 IST
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yep...nisha is right...
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see da "letter to santa" in ma album ...!!! |
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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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