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Mathematics 8 Online
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

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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