(ii) and (iv) can’t be the probability of occurrence of an event. So, (ii) and (iv) are the answers to our question.

Explanation:

We know that,

i.e. probability can vary from 0 to 1(both are inclusive)

So, (i) 0 can be possible as

(ii) is not possible as it is less than 0

(iii) is possible as

(iv) is not possible as it is greater than 1

Conclusion: and are the probabilities that cannot occur.