In the following circuit, what is the probability for the me…

In the following circuit, what is the probability for the measurement outcome of Qubit 1 to be in state |1⟩? Here, the states are expressed in the convention |Qubit2⊗Qubit1⟩{“version”:”1.1″,”math”:”\(\vert Qubit_2 \otimes Qubit_1 \rangle\)”}.