<li *ngFor="let x of addressdata;let i = index">
  <div class="col-md-2">
    <input type="radio" [value]="x.PreferedAddress" [(ngModel)]="x.PreferedAddress" (ngModelChange)="RadioCheck(i)" name="radiogroup" id="Prefered"/>
  </div>
</li>

from db i get 3 rows and binding correctly, for particular row only have PreferedAddress=1 remaining has value 0. but in list by default last row radio button is checked