Question

If P(E) is the probability that an event will occur, which of the following must be false?

[1] P(E) = 1 [2] P(E) = 1/2 [3] P(E) = 1/3 [4] P(E) = -1

Answer 1

4 is false

Answer 2

4 because an event has to happen, there can't be a negative probality.

Answer 3

probabilities are only positive

Answer 4

^