SOLUTION: Fill in the formula: The nth triangular number TR (n) is equal to ...

SOLUTION: Fill in the formula: The nth triangular number TR (n) is equal to ...

Algebra.Com

Question 1035212: Fill in the formula: The nth triangular number TR (n) is equal to ...
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
n(n+1)/2
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