(Math: pentagonal numbers) A pentagonal number is defined as n(3n-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 getPentagona1Number(int n) 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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