Question: Write a paragraph that explains why the numbers found in Problem 97 are called triangular. Data from Problem 97 A triangular number is a term

Write a paragraph that explains why the numbers found in Problem 97 are called triangular. 


Data from Problem 97

A triangular number is a term of the sequence u1 = 1, un +1 = un + (n + 1). Write down the first seven triangular numbers. 

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