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प्रश्न
20 cards are numbered from 1 to 20. One card is drawn at random. What is the probability that the number on the cards is odd?
उत्तर
Clearly, the sample space is given by S = {1, 2, 3, 4, 5........19, 20}.
i.e. n(S) = 20
Let E3 = event of getting an odd number
Then E3 = {1, 3, 5, 7, 9, 11, 13, 15, 17, 19}
i.e. n(E3) = 10
Hence, required probability = P(E3) = \[\frac{10}{20} = \frac{1}{2}\]
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