Easy
If you provide a service in the "providers" section of two @Component decorator components, how many service instances will be created?
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Why is the following snippet not validated?
```jsx
<h1>Products Lists</h1>
<ul>
<li *ngFor="let p of products" *ngIf="p.stock > 0">
{{ p.name }}
</li>
</ul>
```
Answer: We cannot have ngFor and ngIf on the same element12
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