# Puzzle of the Week for 16 November 1998

A friend tells you that you can flip an ordinary penny 10 times and that it
will land heads up 10 times in a row. To prove it, your friend gives you
the penny, and following her instructions, you toss it 10 times. Sure enough,
it lands heads up 10 times in a row. Afterwards, you toss it again, and it
lands tails up about half the time. How is this possible?

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