Friday, November 14, 2008
November 14, 2008
For how many values of
a
is it true that the line
y
=
x
+
a
passes through the vertex of the parabola
y
=
x
^{2}
+
a
^{2}
?
Interactive version of problem and solution.
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Hexaflexagons, Probability Paradoxes, and the Tower of Hanoi
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