# Logic Families – 41

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41. Using the schematic diagram of a TTL NAND gate, determine the state of each transistor (ON or OFF) when all inputs are high.

(a) Q1-ON, Q2-OFF, Q3-ON, Q4-OFF
(b) Q1-ON, Q2-ON, Q3-OFF, Q4-OFF
(c) Q1-OFF, Q2-OFF, Q3-ON, Q4-ON
(d) Q1-OFF, Q2-ON, Q3-OFF, Q4-ON

Explanation
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