Electronic lock using basic logic gates

Answer the questions below by referring the diagram shown below:

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For the application shown above, analyse and obtain the simplified algebraic expression for output Y.
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If the OR gate in above figure is replaced by AND gate, then obtain the expression for output Y.
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If the AND gates are replaced by OR and vice versa obtain the simplified expression for output Y.
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Select the simplified logical expression for output Y if all NOT gates are removed.
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The method of logic circuit simplification requires that the logic expression should be in sum-of-product form or product –of-sum form. Which of the following represents the SOP form?
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