please help me with no. 1 and 2 and 3 with solution. thank you
Extracted text: EXERCISE MATH SELFIE A. Show that each of the following is a probability mass function. if x € {1, 2} X, 1. P(X=x)3D{3 otherwise. x*, if x E {1, 2, 3, 4, 5} 2. P(X=x)=D{55 0, otherwise. 3. P(X=x)=D{6 if x € {1, 2, 3, 4, 5, 6} 0, otherwise. if x E{1, 2, 3, 4, 5, 6} 4. P(X=x)={91 [0, otherwise. 5. P(X=x)=D204 if x €{1, 2, 3, ..., 8} 0, otherwise.