Detection of SA1 faults on a VLSI circuit for 4-input Priority Encoder circuit

If N number of wires are present in circuit then maximum how many number of single stuck at fault is possible?

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If N number of wires are present in circuit then maximum how many number of multiple stuck at fault is possible?
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Identify the correct outputs for a 4 to 2 priority encoder with inputs - D0, D1, D2 and D3.
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If two inputs are active on a priority encoder, the higher value which will be coded on the output.
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Which of this following is true representation of A at stuck at one fault?
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