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📐 Mathematics  ·  Probability (Class 11)  ·  JEE

The formula P(A) = n(A)/n(S) is valid only when:

Answer: All outcomes in the sample space are equally likely.

  • A The event A is a simple event containing one outcome
  • B The events under consideration are mutually exclusive
  • C All outcomes in the sample space are equally likely
  • D The sample space contains a finite number of outcomes only

Correct answer: C. All outcomes in the sample space are equally likely

Explanation: Counting favourable outcomes assumes each carries the same weight; for a biased die or unequal outcomes the axiomatic definition must be used instead.

Concept context

Random experiments, sample space, events, and the axiomatic approach to probability

Read the full Probability (Class 11) notes →