10thtriangularnumber

<-- Enter triangular number statement
  

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Calculate triangular number 10

The formula for triangular number n is as follows

Tn  =	n(n + 1)
	2

Given n = 10, we have:

T10  =	10(10 + 1)
	2

T10  =	10(11)
	2

T10  =	110
	2

T₁₀ = 55

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