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Out of 18 points in a plane, no three are in the same line except five points which are collinear. Find the number of lines that can be formed joining the point.
[Hint: Number of straight lines ]
Answers (1)
Number of straight lines formed by joining 18 points taking 2 at a time=
Number of straight lines formed by joining 5 collinear points taking 2 at a time=
5 collinear points when joined pairwise give only one line.
Required number of straight lines=
View full answer
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