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adam321:
-The first four triangular numbers are 1, 3, 6 and 10. -What is the 10th triangular number??
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Vocaloid:
rule for triangular numbers nth triangular number = n(n+1)/2 so for the 10th triangular number, plug n = 10 into the formula here's an explanation on how this formula is derived: https://www.mathsisfun.com/algebra/triangular-numbers.html
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