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The exercice is validated is all questions of the exercice are validated
The question 1 is validated if the output of the fitted model is:
```python
LinearRegression(copy_X=True, fit_intercept=[[1], [2.1], [3]], n_jobs=None,
                normalize=[[1], [2], [3]])
```
The question 2 is validated if the output is:
```python
array([[3.96013289]])
```
The question 3 is validated if the output is:
```output
Coefficients:  [[0.99667774]]
Intercept:  [-0.02657807]
Score:  0.9966777408637874
```