A) \[\frac{1}{5}\]
B) \[\frac{5}{21}\]
C) \[\frac{21}{20}\]
D) \[\frac{11}{5}\]
Correct Answer: D
Solution :
Let roots be \[\alpha ,\ \beta \] then H.M. \[=\frac{2\alpha \beta }{\alpha +\beta }=\frac{11\times 2}{10}=\frac{11}{5}\].
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