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3 non-interacting fermions are confined in a 2-D box of area ‘a2'. If the energy' of the 1st excited state of the system is 
    Correct answer is '12'. Can you explain this answer?
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    3 non-interacting fermions are confined in a 2-D box of area ‘a2...
    Energy of a particle in a 2-D box is

    where,  is ground state,  is the 1st excited state.
    Therefore, 1st excited state has one fermion each in (1,1), (1,2), (2,1) levels.
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    3 non-interacting fermions are confined in a 2-D box of area ‘a2'. If the energy' of the 1st excited state of thesystem isCorrect answer is '12'. Can you explain this answer?
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