How many chords can be drawn through 21points on a circle ? – InterviewSolution

1.	How many chords can be drawn through 21points on a circle ?
Answer» Number of points = 21 Hence n = 21 A chord connects circle at 2 points Hence, r = 2 Number of chord from 21 points = nCr = 21C2 = 21!/2!(21−2) = 21!/(2

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