[net.math] Yet another envelope stuffing problem.

ecn-ec:ecn-pc:ecn-ed:vu@pur-ee.UUCP (08/30/83)

	I read this problem sometime last year. Probably it was some old
problem from some old contest (W. L. Putnam Comp, or USSR olympiad, or
the International Math Olympiad).

	A secretary wrote n letters and addressed n envelopes. Calculate
the probability that she got p ( 0 <= p <= n ) letters in the right
envelopes if she stuffed them randomly.


	Please mail answers, comments, flames, references, anything, ...
to pur-ee!norris since my current account pur-ee!vu will be terminated
soon. In the meantime, I will make another raid in the library to find the
original problem.

	Hao-Nhien Vu.
	Purdue U.