1stpentagonalnumber

<-- Enter pentagonal number statement
  

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Calculate pentagonal number 1

The formula for pentagonal number n is as follows

Pn  =	n(3n - 1)
	2

Given n = 1, we have:

P1  =	1(3(1) - 1)
	2

P1  =	1(3 - 1)
	2

P1  =	1(2)
	2

P1  =	2
	2

P₁ = 1

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