22. How many inputs of a four-input AND gate must be HIGH in order for the output of the logic gate to go HIGH?

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23. If the output of a three-input AND gate must be a logic LOW, what must the condition of the inputs be?

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24. Logically, the output of a NOR gate would have the same Boolean expression as a(n):

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25. A logic probe is placed on the output of a gate and the display indicator is dim. A pulser is used on each of the input terminals, but the output indication does not change. What is wrong?

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26. What is the Boolean expression for a three-input AND gate?

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27.
Which of the following gates has the exact inverse output of the OR gate for all possible input combinations?

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28. What is the difference between a 7400 and a 7411 IC?

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