Universal NAND gate and its application in level monitoring in chemical plant

The combinational circuit for one bit equality checker is shown below. The Boolean expression for output Y is________.
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Identify the equivalent circuit for the Boolean expression Y = A'BC'D + A'BCD +ABD .

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For the given combinational circuit determine the simplified final output at Y.
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If anyone of the inputs of a multiple-input-NAND gate is connected to ground (logic 0) the output is________.
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The performance of an application is represented by Y = [(AB)' + (A+B)']AB' . Which of the following is a simplified expression for Y?
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