If the harmonic mean between $ a $ and $ b $ is $ H $, then the value of $ \frac{1}{H-a}+\frac{1}{H-b} $ is

JEE MATHEMATICS MCQ: SEQUENCE OF SERIES

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Application +4 | -1

If the harmonic mean between

a

and

b

H

, then the value of

\frac{1}{H-a}+\frac{1}{H-b}

View answer and explanation

Correct option: C

\frac{1}{a}+\frac{1}{b}

Option C (

\frac{1}{a}+\frac{1}{b}

) is correct because substituting the formula for H and simplifying the expression leads to the given result.

Practice All Chapter MCQs →

A=\{1,2,3\}, B=\{3,4\}, C=\{4,5,6\}

{A} \cup({B} \cap {C})

A-(B \cap C)

(B \cup C)-A

a,b,c

a,x,b

b,y,c

{x^2},{b^2},{y^2}

P(x)=1-x+x^2-x^3+\ldots+x^{2012}

y

Q(y)=a_0+a_1 y+\ldots+a_{2012} y^{2012}

y=x-2

\sum\limits_{{i=0}}^{2012} a_i

\log \left(\frac{5 c}{a}\right), \log \left(\frac{3 b}{5 c}\right)

\log \left(\frac{a}{3 b}\right)

A P

a, b

G P

a, b, c

\frac{3}{4}