Out of 18 points in a plane no three are in the same straight line except five points which are collinear. The number of straight lines that can be formed joining them, is

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Correct answer: B. 144

The number of straight lines = ¹⁸ C₂- ( ^5 C₂-1 )=144

Out of 18 points in a plane no three are in the same straight line except five points which are collinear. The number of straight lines that can be formed joining them, is

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