Write a class called "SumAndAverage" to produce the sum of 7, 2, 3, ., to N, where N is a positive integer number inputted by the user from the keyboard. The program should use the 'Do-While loop; check the user's input, and ask the user to re- 1. 2. input a valid value if N is not a positive integer3B compute and display the sum and the average 3. of 1, 2, 3,.., to N;

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