Question: Flip a coin twice. On each flip, the probability of head equal p. Let X1 equal the number of heads (either (0 or I) on

Flip a coin twice. On each flip, the probability of head equal p. Let X1 equal the number of heads (either (0 or I) on flip i. Let W = X1 - X2 and Y = X1 + X2. Find Pw,y(w.y), Pw y(w|y), and PY|W y|w).

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