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//program to create a function that calculates sum of numbers between two numbers a and b (a nd b are passed to function as integer arguments ) class sumnumbers { public void sum(int a,int b) { int sum=0; int i; for(i=a;i<=b;i++) { sum=sum+i; } System.out.println("sum of numbers between a and b is " + sum); } } public class sumnumbersatob { public static void main(String[] args) { sumnumbers ob=new sumnumbers(); ob.sum(5,15); } }