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Question

Out of 18 points in a plane, no three are in the same straight line except 5 points which are collinear. How many straight lines can be formed by joining them?
 


  1. 144
     

  2. 143
     

  3. 145
     

  4. 288


Solution

The correct option is A

144
 


18 points are given out of which 5 are collinear.

The number of straight lines 18C25C2+1=144

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