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Three new antivirus software are being developed to target and clean computer viruses. We then define the following events: A = event that Antivirus A detects the virus B = event that Antivirus B detects the virus C = event that Antivirus C detects the virus Express the following events in terms of A, B, and C: 1. event where Antivirus A did not detect the virus 2. event where Antivirus B and C detects the virus 3. event where all three Antivirus detect the virus 4. event where at least one of Antivirus B or C detects the virus