Question: It is a question in algorithm and complexity. Please, I need the step by step proof. thanks 1. Explain in few lines the NP-Hardness and

It is a question in algorithm and complexity. Please, I need the step by step proof. thanks

1. Explain in few lines the NP-Hardness and NP-Completeness of a decision problem. 2. Show that, if NP and Co-NP are different, then P and NP are also different

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