|q⟩ Bad Qubits

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Multiple choice
The joint distribution of (X, Y) is P(0,0) = 1/2, P(0,1) = 1/4, P(1,0) = 0, P(1,1) = 1/4. Using H(Y|X) = H(X,Y) - H(X), what is the conditional entropy H(Y|X) in bits?