SOLUTION: If any two points determine a line, how many lines are determined by seven points in a plane, no three of which are collinear?
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Question 298289: If any two points determine a line, how many lines are determined by seven points in a plane, no three of which are collinear? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! If any two points determine a line, how many lines are determined by seven points in a plane, no three of which are collinear?
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Each pair of points determines one line.
There are 7C2 = 7*6/1*2 = 21 pairs so 21 lines are determined
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Cheers,
Stan H.
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