6thpentagonalnumber

<-- Enter pentagonal number statement
  

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Calculate pentagonal number 6

The formula for pentagonal number n is as follows

Pn  =	n(3n - 1)
	2

Given n = 6, we have:

P6  =	6(3(6) - 1)
	2

P6  =	6(18 - 1)
	2

P6  =	6(17)
	2

P6  =	102
	2

P₆ = 51

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