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    • Question

      How many straight lines can be formed from 9 points out

      of which 4 are colinear?
      A 31 Correct Answer Incorrect Answer
      B 32 Correct Answer Incorrect Answer
      C 33 Correct Answer Incorrect Answer
      D 34 Correct Answer Incorrect Answer

      Solution

      No of straight lines formed from N point out of which M points are colinear = NC2 - MC2 +1   =  9C2 - 4C2 +1 = 36 - 6 +1 =  31

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