How many chords can be drawn …
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Yogita Ingle 6 years, 4 months ago
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! 19! )
= (21 × 20 × 19!)/((2 × 1) × 19!)
= (21 × 20)/(2 ) = 210 chords.
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