Question
$6, 7, 18, ........$ એ પ્રમાણમાં છે.

Answer

$6 : 7 :: 18 : x$
$\frac{6}{7} = \frac{18}{x}$
$6x = 18 \times 7$
$x = \frac{126}{6} = 21$
તેથી, ખાલી જગ્યામાં $21$ આવશે.

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