Unable to set value for p-dropdown in angular

> html file

<p-dropdown name="abc"
formControlName="abc" #abcDropdown
(onChange)="abcOptionSelected('abc')"
[options]='abcDropdownOptions' styleClass='ee-input' placeholder=''
[style]="{'width': '50%'}">
</p-dropdown>

> component.ts file
abcOptions.forEach(abcd=> {
this.abcDropdownOptions.push({ label: abcd.toString(), value: abcd});
});
this.formControls.abc.setValue(3);


what am i doing wrong. I am trying to setvalue for p-dropdown from component.ts but the value is not reflecting in UI.

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