4 thoughts on “PnC : Summing Up

  1. Sorry to post this question in random thread…But since its quite relevant I m posting It..

    Answer the questions independently of each other.

    There are 12 points in a plane, out of which only four are collinear and the remaining eight are non-collinear. How many non-overlapping straight line segment can be drawn by joining any two of these points?
    Actually I got two different solution within IMS Test papers..

  2. Sir,
    In the formula for type where we distribute ‘x’ distinct objects into ‘y’ distinct groups AND there is arrangement within groups, shouldn’t it read ” Send n distinct objects to r distinct groups”,
    since the answer is P(n+r-1, n) ?

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