Question

probability of an event E+ probability pf the event
(not E) is,....​

Answer 1

Probability of an Event 'E' + Probability of the Event 'Not E' is = 1

Answer 2

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• Probability of an event E + Probability of the event not E = 1. Such an event is called impossible event.
• The probability of an event that is certain to happen is 1. Such an event is called sure or certain event.