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Grade: 11 

                        
if 1/a,1/b,1/c,1/d are in AP prove that ab + bc +cd = 3ad
4 years ago

Answers : (2)

Nishant Vora
IIT Patna
askIITians Faculty
2467 Points 
							Hey student,

You can find a similar question here

http://www.askiitians.com/forums/Algebra/if-a-b-c-d-are-in-hp-then-prove-that-ab-bc_95273.htm
4 years ago
mycroft holmes
272 Points 
							
Dividing by abcd, we have to prove that \frac{1}{cd}+\frac{1}{ad}+\frac{1}{ab} = \frac{3}{bc} or
 
that \frac{1}{cd}+\frac{1}{ad}+\frac{1}{ab} + \frac{1}{bc} = \frac{4}{bc}
 
LHS can be factorised as \left(\frac{1}{c}+\frac{1}{a} \right) \left(\frac{1}{b} + \frac{1}{d} \right)
 
Since the given numbers are in AP we have 
\left(\frac{1}{c}+\frac{1}{a} \right) = \frac{2}{b}; \left(\frac{1}{b} + \frac{1}{d} \right) = \frac{2}{c}
 
Hence we get \left(\frac{1}{c}+\frac{1}{a} \right) \left(\frac{1}{b} + \frac{1}{d} \right) = \frac{2}{b} \times \frac{2}{c} = \frac{4}{bc}
4 years ago
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