3rdhexagonalnumber

<-- Enter hexagonal number statement
  

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Calculate hexagonal number 3

The formula for hexagonal number n is as follows
H_n = n(2n - 1)

Given n = 3, we have:
H_n = 3(2(3) - 1)
H_n = 3(6 - 1)
H_n = 3(5)
H₃ = 15

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