computer architecture - Digital Design simple operation finding of Mux and Decode? -


my filed not digital design ran simple problem. how can find operation of following 2 diagram without using truth table ? (i.e write equation these)

enter image description here

we not supposed homework. give idea, here answer.

mux: c.not(b).a + b.not(a)

it 3 8 decoder: not(a).b.c + a.not(b).not(c) + a.not(b).c


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