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Suppose that the probability of observing |0⟩ in the state |ϕ1⟩ is 1/4 and the probability of
observing |1⟩ in the qubit |ϕ2⟩ is 1/3.

Find the probability of observing |10⟩ in the state |ϕ1ϕ2⟩.

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