These are the options for the Question: Let E be an event such that P(not E)=1/5,then P(E)is equal to:
(a) 1/5
(b) 2/5
(c) 0
(d) 4/5
The correct answer: Given that P(not E) = 1/5, we can find P(E) as follows:
P(not E) = 1/5
1 – P(E) = 1/5 (since P(not E) = 1 – P(E))
P(E) = 1 – P(not E)
P(E) = 1 – 1/5
P(E) = 4/5
Therefore, the answer is (d) 4/5.
