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Events E1, E2, ..., En of a sample space are called exhaustive when:
AEach pair of them is disjoint
BEach has the same probability
CEach contains one sample point
DAt least one of them must occur
Answer & Solution
Correct answer: D. At least one of them must occur
1. Exhaustive means the events together cover the whole sample space.
2. Their union is S, so no outcome falls outside all of them.
3. Equivalently, at least one of the events necessarily occurs in every trial.
_Source: NCERT Class 11 Mathematics, Ch 14 'Probability' (kemh114)_
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