In probability calculus, a negation is the probability that:

A) an event will not occur
B) one event will cause another
C) the same event will occur twice
D) two events will both occur
E) one or the other of two events will occur

Probability Calculus

A branch of mathematics that deals with calculating the likelihood of different possible outcomes.

Negation

The logical operation that takes a proposition to its opposite in truth value, from true to false and vice versa.

Event

An occurrence or happening, particularly one of significance, that can be distinctly identified in time and space.