(i) As per the question the bag contains lemon flavoured candies only.

It does not contain even a single orange flavor candy.

This shows that every time, she will take out only lemon flavor candy.

Therefore, event that Malini will take out an orange flavoured candy is an impossible event.

Hence,

P (an orange flavoured candy) = 0

(ii) As the bag has lemon flavoured candies, Malini will take out only lemon flavoured candies. Therefore, event that Malini will take out a lemon flavoured candy is a sure event

P (a lemon flavoured candy) = 1