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

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There are 10 points in a plane, no three of which are in the same straight line, except 4 points, which are collinear. Find the number of lines obtained from the pairs of these points,

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VMC MODULES ENGLISH-PERMUTATION & COMBINATION-JEE ARCHIVE
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