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It is T/2 * (t+1).
http://wiki.answers.com/Q/What_is_nth_term_of_tria...
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0.5n(n+1). I finally got the thing! Awesome! Or alternatively: ½ n. 2.+ ½ n. or: ½ (n. 2.+n). a more simple answer is. (n. 2 ÷ 2)+. ½ n. e.g:- 10x10
http://wiki.answers.com/Q/What_is_the_Nth_term_for...
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1/. 6 n(n+1)(n+2).
http://wiki.answers.com/Q/What_is_the_form_of_the_...
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The sum of the numbers 1 to 97 ie (97 + 1) x 97/2 which is 4753.
http://wiki.answers.com/Q/What_is_the_97nth_triang...
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