3rdpentagonalnumber

<-- Enter pentagonal number statement
  

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Calculate pentagonal number 3

The formula for pentagonal number n is as follows

Pn  =	n(3n - 1)
	2

Given n = 3, we have:

P3  =	3(3(3) - 1)
	2

P3  =	3(9 - 1)
	2

P3  =	3(8)
	2

P3  =	24
	2

P₃ = 12

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