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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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