Chapter 14 · Question 4

What are the minimum and maximum possible values of probability?

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Answer

Direct Answer

For any event EE, 0P(E)10\le P(E)\le1. Impossible event has probability 00 and sure event has probability 11.

Simple Explanation

Probability cannot be less than 0 or greater than 1.

Exam-Ready Structure

The number of favourable outcomes cannot be negative and cannot exceed the total number of outcomes. Therefore 0P(E)10\le P(E)\le1. If no outcome favours EE, P(E)=0P(E)=0. If every outcome favours EE, P(E)=1P(E)=1.

Key Points

  • For any event EE, 0P(E)10\le P(E)\le1.