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Answer the following.

Draw the logic gate diagram for 8 : 1 multiplexer.

Computer Science20263 marksDrawing

Draw: Logic gate diagram for an 8 : 1 multiplexer

Must show: 8 data inputs, 3 select lines, output

Answer

Answer

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Logic gate diagram of an 8:1 multiplexer: data inputs $I_0$ to $I_7$, select lines $S_2 S_1 S_0$ (with their complements), eight 4-input AND gates (one for each select combination) and an 8-input OR gate. $Y = S_2'S_1'S_0'I_0 + S_2'S_1'S_0I_1 + S_2'S_1S_0'I_2 + S_2'S_1S_0I_3 + S_2S_1'S_0'I_4 + S_2S_1'S_0I_5 + S_2S_1S_0'I_6 + S_2S_1S_0I_7$
Diagram for this answer
Computer Hardware

From ISC 2026 Improvement Computer Science Paper 1, question 3(i)(b).