H.M. between the roots of the equation
$x^{2} - 10 x + 11 = 0$ is :

\frac{1}{5}

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\frac{5}{21}

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\frac{21}{20}

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\frac{11}{5}

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Solution

The correct option is B $\frac{11}{5}$
$x^{2} - 10 x + 11 = 0$
seem = +10
product = 11
$H M = \frac{2 (a b)}{a + b}$
$= \frac{11}{10} = \frac{11}{5}$

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2 \frac{1}{5} \div 1 \frac{1}{5} =

2 \frac{1}{5} \div 1 \frac{1}{5}

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