Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.
|
|
John
Posts:
54
Registered:
12/6/04
|
|
a gift exchange
Posted:
Nov 24, 2004 12:35 AM
|
|
Ten friends organize a gift exchange. The ten names are put in a hat,
and the first person draws one. If they pick their own name, they
return it to the bag and draw again, until they have a name that is
not their own. Then the second person draws, again returning their
own name if they draw it. This continues down the line. What is the
probability that when the 10th person draws, only their own name will
be left in the bag?
any help!!!
--
submissions: post to k12.ed.math or e-mail to k12math@k12groups.org
private e-mail to the k12.ed.math moderator: kem-moderator@k12groups.org
newsgroup website: <a href="http://www.thinkspot.net/k12math/">http://www.thinkspot.net/k12math/</a>
newsgroup charter: <a href="http://www.thinkspot.net/k12math/charter.html">http://www.thinkspot.net/k12math/charter.html</a>
|
|
|
|
