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OpenStudy (anonymous):
15 points lie around a circle. Each point is connected to every other point by a straight line. How many lines are formed in this way? I don't understand why the answer is 105. Shouldn't it be 14 factorial (14!) because if you think about the first point connecting it to 14 other points, then the next point 13 (because one of the paths is counted in that 14 previously) etc... Please help
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