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1.public class cc {

public double sum(){
  double m=1;
  double n=2;
  double sum=0;
 
  for(int i=0;i <20;i++ ){
  sum=sum+m/n;
  double temp=m;
  m=n;
  n=m+temp;
  }
 
  return sum;
}

public static void main(String[] args){
  cc t=new cc();
  System.out.println(t.sum());
}

}


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