Question: Solve this problem The triangular number to is the number of dots in a triangular array of dots consisting of n rows. 1 = 1,

Solve this problem

The triangular number to is the number of dots in a triangular array of dots consisting of n rows. 1 = 1, t2 = 3, t3 = 6, That is, there must be 1 dot in the first row, 2 dots in the second row, 3 dots in the third row, and so forth. (a) Express to as a sum using sigma notation. (b) What is the closed formula for th

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