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3rdoctagonalnumber
<-- Enter octagonal number statement
Calculate octagonal number 3
The formula for octagonal number n is as follows
O
n
= n(3n - 2)
Given n = 3, we have:
O
n
= 3(3(3) - 2)
O
n
= 3(9 - 2)
O
n
= 3(7)
O
3
=
21
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