The probability of an event that is certain to happen is __________. Such an event is called______

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Step 1: Search for the suitable event to the given problem
Sure event:
A sure event is an event, which always happens. For example, it's a sure
event to obtain a number between “1” and “6” when rolling an ordinary die.
The probability of a sure event has the value of 1.
The probability of an event that is certain to happen is 1(ONE). Such an event is called SURE EVENT