XOR gate and its application in staircase light control

A four input XOR logic has inputs ABCD = 1011. The output of the XOR gate would be ___________.
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___________gate can be used as parity generators and checkers.
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Choose the correct output Y for the even parity generator for the data input D0D1D2D3 = 0000.
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Determine the input conditions needed to produce Y = 1 for the circuit shown below.
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A two input XNOR gate can be used to produce a high output when the two inputs match exactly. Select valid option.
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