1sttriangularnumber

<-- Enter triangular number statement
  

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Calculate triangular number 1

The formula for triangular number n is as follows

Tn  =	n(n + 1)
	2

Given n = 1, we have:

T1  =	1(1 + 1)
	2

T1  =	1(2)
	2

T1  =	2
	2

T₁ = 1

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