Question: Implement a Java class as specified below. The method sum returns the sum of the series: j=1njk=1k+2k+3k++nk The method should return the exact value of

Implement a Java class as specified below. The method sum returns the sum of the series: j=1njk=1k+2k+3k++nk The method should return the exact value of the summation if it is within the range of the integer type long. A sample test program is provided in the main method. The output of the test code is shown below. s1=5850s2=338350s3=25502500s4=1142968763055076425

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