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3rdpentagonalnumber
<-- Enter pentagonal number statement
Calculate pentagonal number 3
The formula for pentagonal number n is as follows
P
n
=
n(3n - 1)
2
Given n = 3, we have:
P
3
=
3(3(3) - 1)
2
P
3
=
3(9 - 1)
2
P
3
=
3(8)
2
P
3
=
24
2
P
3
=
12
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