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Logic & Puzzles

If a NAND gate driving an LED display experiences high input impedance, which consequence follows for the display's segments?

A)Segments will exhibit reduced brightness
B)Segments will flicker intermittently
C)Segments display unpredictable, random patterns
D)Segments will all illuminate continuously

💡 Explanation

Because high impedance on a NAND gate's input effectively floats the input to a logical high state, the output defaults to low. Consequently, all connected LED segments will receive a continuous ground, therefore, they will all illuminate rather than exhibiting reduced brightness due to voltage drop.

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