Question :

Let and be the joint probability distribution

i) Find P(X_1 + X_2)

ii) Are X_1 and X_2 independent

iii) P(X_1 = 0 | X_2 = 1)

I need to know how to get the value of

Here is my work

And also want to know the if my answers of ii) and iii) are correct or no ?

i) ???

ii) Answer

Since are not independent

iii) Answer

Please provide me with the answer for i) ?????????