Question: In Java A pentagonal number is defined as n ( 3 n 1 ) / 2 n ( 3 n 1 ) / 2 for

In Java

A pentagonal number is defined as $n (3 n - 1) / 2$ for $n = 1, 2,$ , and so on. Therefore, the first few numbers are 1, 5, 12, 22, ... .

Write a method with the following header that returns a pentagonal number:

public static int getPentagonalNumber(int n)

For example, getPentagonalNumber(1) returns 1 and getPentagonal Number(2) returns 5. Write a test program that uses this method to display the first 100 pentagonal numbers with 10 numbers on each line.

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