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प्रश्न
A card is drawn from a well-shuffled pack of playing cards. What is the probability that it is either a spade or an ace or both?
उत्तर
`P(A) = 13/52`
`P(B) = 4/52`
`P(A ∩ B) = 1/5.2`
`P(A ∪ B) = 13/52 + 4/52 - 1/52`
`= 16/52`
`P(A ∪ B) = 4/13`
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