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10thpentagonalnumber
<-- Enter pentagonal number statement
Calculate pentagonal number 10
The formula for pentagonal number n is as follows
P
n
=
n(3n - 1)
2
Given n = 10, we have:
P
10
=
10(3(10) - 1)
2
P
10
=
10(30 - 1)
2
P
10
=
10(29)
2
P
10
=
290
2
P
10
=
145
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