Question: Suppose you have two regressors: X1 is binary (takes values 0 and 1) and X2 is categorical with 3 categories (A,B,C).Write E[Y j X1,X2] as

Suppose you have two regressors: X1 is binary (takes values 0 and 1) and X2 is categorical with 3 categories (A,B,C).Write E[Y j X1,X2] as a linear regression.

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