2ndnonagonalnumber

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Calculate nonagonal number 2

The formula for nonagonal number n is as follows

Nn  =	n(7n - 5)
	2

Given n = 2, we have:

N2  =	2(7(2) - 5)
	2

N2  =	2(14 - 5)
	2

N2  =	2(9)
	2

N2  =	18
	2

N₂ = 9

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