How many straight lines can be drawn with 18 points on a plane of which no points are collinear?

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Solution

line is formed by Joining 2 pt .6 $∴$ no. of
Ways $=^{18} C_{2} = 153$

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How many straight lines can be drawn with 18 points on a plane of which no points are collinear?

line is formed by Joining 2 pt .6 ∴ no. ofWays =18C2=153

line is formed by Joining 2 pt .6 $∴$ no. of
Ways $=^{18} C_{2} = 153$