Article View: sci.math.stat
Article #347Re: two pairs
From: Arthur Rubin
Date: Tue, 15 Sep 1992 21:26
Date: Tue, 15 Sep 1992 21:26
25 lines
1220 bytes
1220 bytes
In <1992Sep15.024945.17690@wuecl.wustl.edu> ppc1@cec1.wustl.edu (Peter Pui Tak Chiu) writes: >hi, >can anyone point out what is wrong with my calculation of getting a hand >of two pairs from a shuffled deck of cards? > the probability i have is: > (13 * 4C2) (12 * 4C2) (4 * 11) > ------------------------------ = 0.095078 > 52C5 >which is exactly two times the correct value (0.047539). >pete You can't distinguish between the pairs, so you have to divide by 2. -- Arthur L. Rubin: a_rubin@dsg4.dse.beckman.com (work) Beckman Instruments/Brea 216-5888@mcimail.com 70707.453@compuserve.com arthur@pnet01.cts.com (personal) My opinions are my own, and do not represent those of my employer. My interaction with our news system is unstable; please mail anything important.
Technical Details
Message-ID:
<a_rubin.716592371@dn66>Path:
arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!news.acns.nwu.edu!network.ucsd.edu!mvb.saic.com!unogate!beckman.com!dn66!a_rubinReferences:
<1992Sep15.024945.17690@wuecl.wustl.edu>Show Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!news.acns.nwu.edu!network.ucsd.edu!mvb.saic.com!unogate!beckman.com!dn66!a_rubin Newsgroups: sci.math.stat Subject: Re: two pairs Message-ID: <a_rubin.716592371@dn66> From: a_rubin@dsg4.dse.beckman.com (Arthur Rubin) Date: 15 Sep 92 21:26:11 GMT References: <1992Sep15.024945.17690@wuecl.wustl.edu> Nntp-Posting-Host: dn66.dse.beckman.com Lines: 25