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please explain how to start solving such circuital questions..I always get confused..plzz help someone asap.

What will be the final output?

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Decoder Output

D0 = (A'.B'), D1 = (A'.B), D2 = (A.B'), D3 = (A.B)

Mux Output

F(A, B, C, D) = D'.C'.(A'.B) + D'.C(A'.B') + D.C'.(A.B) + D.C.(A.B')  

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