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प्रश्न
Events E and F are such that P(not E or not F) = 0.25, State whether E and F are mutually exclusive.
उत्तर
P(not E or not F) = P(E ∩ F)
= P[(E ∪ F)’]
i.e. = 1 – P(E ∪ F) = 0.25
or P(E ∪ F) = 1 – 0.25
= 0.75
∴ P(E ∪ F) ≠ 0 Hence, E and F are not mutually exclusive.
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