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Permutations and Combinations
How many chords can be drawn for a circle with 21 points on the circle?
$\begin{array}{1 1} (21)! \\ 210 \\ (20)! \\ 42 \end{array}$
jeemain
math
class11
ch7
permutations-and-combinations
combinations
easy
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asked
Aug 20, 2013
by
rvidyagovindarajan_1
edited
Apr 5, 2016
by
meena.p
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1 Answer
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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