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How many chords can be drawn for a circle with 21 points on the circle?

$\begin{array}{1 1} (21)! \\ 210 \\ (20)! \\ 42 \end{array}$

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A chord can be drawn using any two points on the circle.
None of the points are collinear.
$\therefore$ No. of chords = $^{21}C_2=210$
answered Aug 20, 2013 by rvidyagovindarajan_1

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