Question

P(x)+P("not x") =

• A. -1
• B. -2
• C. 1
• D. 2

Answer 1

The Correct Option is C

To solve this problem, we need to apply the basic rule of probability regarding complementary events.

1. Understanding Complementary Events:
If \( P(x) \) is the probability of an event \( x \), then \( P(\text{not } x) \) is the probability of the event not happening.
The sum of the probabilities of an event and its complement is always 1:

\( P(x) + P(\text{not } x) = 1 \)

2. Applying the Rule:
We directly apply the above rule to this question:

\( P(x) + P(\text{not } x) = 1 \)

Final Answer:
The correct option is (C) 1.