UNIVERSITY OF MARYLAND MATHEMATICS COMPETITION

                        PART II,  1999

  1.Twelve tables are set up in a row for a Millenium party.
    You want to put 2000 cupcakes on the tables so that the
    numbers of cupcakes on adjacent tables always differ by
    one (for example, if the 5th table has 20 cupcakes, then
    the 4th table has either 19 or 21 cupcakes, and the 6th 
    table has either 19 or 21 cupcakes).
    a) Find a way to do this.
    b) Suppose a Y2K bug eats one of the cupcakes, so you
        have only 1999 cupcakes. Show that it is impossible
        to arrange the cupcakes on the tables according to
        the above conditions.


  2.Let P and Q lie on the hypotenuse AB of the right triangle
    CAB so that |AP|=|PQ|=|QB|=|AB|/3. Suppose that
    |CP|2+|CQ|2=5.
    Prove that |AB| has the same value
    for all such triangles, and find that value.
    Note: |XY| denotes the length of the segment XY.


  3.Let P be a polynomial with integer coefficients and let
    a, b, c be integers. Suppose P(a)=b, P(b)=c, and P(c)=a.
    Prove that a=b=c.

  4.A lattice point is a point (x,y) in the plane for which both
    x and y are integers. Each lattice point is painted  with one
    of 1999 available colors.
    Prove that there is a rectangle (of nonzero height and width)
    whose corners are lattice points of the same color.


  5.A 1999-by-1999 chocolate bar has vertical and horizontal
    grooves which divide it into 19992 one-by-one squares.
    Caesar and Brutus are playing the following game with the
    chocolate bar:   A move consists of a player picking up one
    chocolate rectangle; breaking it along a groove into two smaller
    rectangles; and then either putting both rectangles down
    or eating one piece and putting the other piece down. The
    players move alternately. The one who cannot make a move at
    his turn (because there are only one-by-one squares left) loses. 
    Caesar  starts.  
    Which player has a winning strategy?
    Describe a winning strategy for that player.

Last modified: Thu Oct 28 18:08:06 1999