Solving the State of 2 Qubits from a General Werner State

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Homework Statement



If I was given a general Werner state: u |001> + v |010> + w |100>, where u, v and w are just arbitrary constants. Now, the question is, what is the state of the first two qubits if the third is measured to be |1>?

Homework Equations






The Attempt at a Solution



Do I have to use some sort of properties of product states and entangled states, can someone please help? I don't really know how to approach this problem.
 
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