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?

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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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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