5thhexagonalnumber

<-- Enter hexagonal number statement
  

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Calculate hexagonal number 5

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

Given n = 5, we have:
H_n = 5(2(5) - 1)
H_n = 5(10 - 1)
H_n = 5(9)
H₅ = 45

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