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Correct option is D)

$d+2n =21 $ ........... (1)

or $2n=d+1$

$dn+1 =1$

or $n+1=d$ ............(2)

Substituting for d in equation (1), we get

$2n=n+1+1$

or $2n−n=2$

or $n=2$

$∴d=n+1=2+1=3$

Hence, $dn =32 $

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