Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.3: Informal Geometry And Measurement
Problem 33E
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Question
There are 25 points on the plane and there are no three points on the same straight line. How many triangles are defined by these points?
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i do not understand how 25c3 is equal to 3450. please can you explain?
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