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Tool: Pascals Triangle
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Go to: http://nlvm.usu.edu/en/nav/frames_asid_181_g_4_t_1.html (opens a new window)
Description: Pascal's triangle is a triangular arrangement of numbers corresonding to the probabilities involved in flipping coins, or the number of ways to choose n objects from a group of m indistinguishable objects. It is constructed in such a way that every number in the interior of the triangle is the sum of the two numbers directly above it. This virtual manipulative allows you to view a number of patterns as well as create your own.
Technology Type: Java Applet 
Guide: User's Guide (opens a new window)
Author: National Library of Virtual Manipulatives (Utah State University)
Language: English 
Cost: Does not require payment for use

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Support Material: Ask Dr. Math: FAQ: Pascal's Triangle
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  tpowers
Comment:Not bad at all; explains the major patterns in the triangle. Unfortunately these explanations are not on the main page, so it takes some looking.