You forgot to add a * in ngFor and the var name is wrong
<p *ngFor="let i of Arr(count); let index = index">
<button (click)="removeElement(index)">test</button>
</p>
If you want to print the numbering using index try this, it will help you.
<ul *ngFor="let item of Array; let i = index">
<li> {{i+1}}={{item.name}}</li>
</ul>
For reference: https://angular.io/api/common/NgForOf
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