Angular2 select default first option

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How do i select the first option in a select by default in angular 2 the following code don\'t seems to work.

2 ) If you are using a Form control you need just to set it like default value

 this.fgAddingProduct = new FormGroup({
        category: new FormControl(this.categories[0].id, [Validators.required]),
 });

And use a normal *ngFor

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