We know that the Sum of Squares Regression (SSR) for the model with four predictors (X1, X2, X3, X4) is equal to the SSR for the model with three predictors (X1, X2, X3). Mathematically, this can be written as:
$$
SSR(X1, X2, X3, X4) = SSR(X1, X2, X3)
$$
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