Question bank/JEE Main/Mathematics

$\frac{21}{20}(\frac{1}{r(2r + 1)} + \frac{1}{r(2r - 1)})$ is
equal to

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$= 2(1 - \frac{1}{21})$
$= \frac{40}{21}$

Source: Grass-G / M-16 Mathematics Paper 25 Nov First.docx