How to use FormArray in Reactive Forms in Angular Form.

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How to use FormArray in Reactive Forms in Angular Form?
A FormArray aggregates the values of each child FormControl into an array. It calculates its status by reducing the status values of its children. For example, if one of the controls in a FormArray is invalid, the entire array becomes invalid.

FormArray is one of the three fundamental building blocks used to define forms in Angular, along with FormControl and FormGroup.
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