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6thpentagonalnumber
<-- Enter pentagonal number statement
Calculate pentagonal number 6
The formula for pentagonal number n is as follows
P
n
=
n(3n - 1)
2
Given n = 6, we have:
P
6
=
6(3(6) - 1)
2
P
6
=
6(18 - 1)
2
P
6
=
6(17)
2
P
6
=
102
2
P
6
=
51
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