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# About: Probability Topics: Two Basic Rules of Probability

Module by: Susan Dean, Barbara Illowsky, Ph.D.. E-mail the authors

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 Name: Probability Topics: Two Basic Rules of Probability ID: m16847 Language: English (en) Summary: This module introduces the multiplication and addition rules used when calculating probabilities. Subject: Mathematics and Statistics Keywords: addition, elementary, multiplication, probability, rule, statistics License: Creative Commons Attribution License CC-BY 3.0 Authors: Copyright Holders: Maintainers: Latest version: 1.11 (history) First publication date: May 27, 2008 2:35 pm -0500 Last revision to module: Jun 4, 2012 9:54 pm -0500

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## Version History

 Version: 1.11 Jun 4, 2012 9:54 pm -0500 by Changes: `Probability Topics: Two Basic Rules of Probability: Corrected answer to P(B and N).` Version: 1.10 Jun 4, 2012 9:18 pm -0500 by Changes: `Probability Topics: Two Basic Rules of Probability: Minor edit.` Version: 1.9 Mar 14, 2012 10:11 am -0500 by Changes: `Module: Probability Topics: Two Basic Rules of Probability: Updated language about selecting at random.` Version: 1.8 Aug 12, 2011 10:06 am -0500 by Changes: `Probability Topics: Two Basic Rules of Probability: Updated glossary item "Mutually Exclusive."` Version: 1.7 Feb 19, 2009 5:09 pm -0600 by Changes: ` Probability Topics: Two Basic Rules of Probability: Updated glossary item "Independent Events."` Version: 1.6 Jan 14, 2009 6:40 pm -0600 by Changes: `Probability Topics: Two Basic Rules of Probability: Example 1: Added the sentence to the last bulleted item, "Note that the probability that he does not choose to go anywhere on vacation must be 0.05." ` Version: 1.5 Oct 27, 2008 7:49 pm -0500 by Changes: `roles updated` Version: 1.4 Jul 31, 2008 10:00 am -0500 by Changes: `removed draft note` Version: 1.3 Jul 7, 2008 1:19 pm -0500 by Changes: `post review updates` Version: 1.2 Jun 27, 2008 10:47 am -0500 by Changes: `Roles changed` Version: 1.1 Jun 23, 2008 2:15 am -0500 by Changes: `Initial publication`

## How to Reuse and Attribute This Content

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• the authors' names: Susan Dean, Barbara Illowsky
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## How to Cite and Attribute This Content

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### American Chemical Society (ACS) Style Guide:

Dean, S.; Illowsky, B. Probability Topics: Two Basic Rules of Probability, OpenStax_CNX Web site. http://cnx.org/content/m16847/1.11/, Jun 4, 2012.

### American Medical Assocation (AMA) Manual of Style:

Dean S, Illowsky B. Probability Topics: Two Basic Rules of Probability [OpenStax_CNX Web site]. June 4, 2012. Available at: http://cnx.org/content/m16847/1.11/.

### American Psychological Assocation (APA) Publication Manual:

Dean, S., & Illowsky, B. (2012, June 4). Probability Topics: Two Basic Rules of Probability. Retrieved from the OpenStax_CNX Web site: http://cnx.org/content/m16847/1.11/

### Chicago Manual of Style (Bibliography):

Dean, Susan, and Barbara Illowsky. "Probability Topics: Two Basic Rules of Probability." OpenStax_CNX. June 4, 2012. http://cnx.org/content/m16847/1.11/.

### Chicago Manual of Style (Note):

Susan Dean and Barbara Illowsky, "Probability Topics: Two Basic Rules of Probability," OpenStax_CNX, June 4, 2012, http://cnx.org/content/m16847/1.11/.

### Chicago Manual of Style (Reference, in Author-Date style):

Dean, S., & Illowsky, B. 2012. Probability Topics: Two Basic Rules of Probability. OpenStax_CNX, June 4, 2012. http://cnx.org/content/m16847/1.11/.

### Modern Languages Association (MLA) Style Manual:

Dean, Susan, and Barbara Illowsky. Probability Topics: Two Basic Rules of Probability. OpenStax_CNX. 4 June 2012 <http://cnx.org/content/m16847/1.11/>.