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OpenStudy (salina):
http://imageshack.us/photo/my-images/818/page661.jpg/ I need help nmuber ,27 the key 27 is: 20.100 thank you in advance
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OpenStudy (anonymous):
http://jwilson.coe.uga.edu/EMT668/EMT668.Folders.F97/Waggener/Problems/Counting%20Problems/Triangular%20Numbers/TRInums.htm Thus in your case plug in 200 for the formula (n+1) times (n/2) to get 201 x 100 thus giving 20,100. Link explains it best.
OpenStudy (salina):
thank you so much , big help
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