Question

Help with#14 please!!!

Answer 1

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Question : 14

let's solve for f :

• $\dfrac{1}{f} = \dfrac{1}{a} + \dfrac{1}{b}$

• $\dfrac{1}{f} = \dfrac{b + a}{ab}$

Taking reciprocal of both sides :

• $f = \dfrac{ab}{a + b}$