Question: The waveforms in Figure 6 - 8 1 are observed on the inputs of a 7 4 HC 1 5 1 8 - input multiplexer.

The waveforms in Figure 6-81 are observed on the inputs of a 74 HC 1518-input multiplexer. Sketch the Y output waveform.In the answer to this question, everyone got 1 at the output when it was in D2, but I did not understand. In the case of D1, D5 or D7, there should be 1 at the output. Why did we get 0 at their output?
The waveforms in Figure 6 - 8 1 are observed on

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