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Ten points are chosen on a circle. A line segment is drawn between every pair of chosen points. How many line segments are drawn?

 Jan 19, 2020
 #1
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9+8+7+6+5+4+3+2+1=45

n/2(n-1) = 5(10-1) = 5*9 = 45

laugh

 Jan 19, 2020

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