1. Complete the following statements:
(i) Probability of an event E + Probability of the event 'not E' = ____ .
(ii) The probability of an event that cannot happen is ____ . Such an event is called ____ .
(iii) The probability of an event that is certain to happen is ____ Such an event is called ____ .
(iv) The sum of the probabilities of all the elementary events of an experiment is
____ .
(v) The probability of an event is greater than or equal to ____ and less than or equal to ____ .