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प्रश्न
A box contains 20 discs which are numbered from 1 to 20. If one disc is drawn at random from the box, then find the probability that the number the drawn disc is a number less than 10.
उत्तर
S = {1, 2, 3, 4, 5, ... 20}
∴ n(S) = 20
Number less than 10 = {1, 2, 3, 4, 5 ... 9}
Required probability = `9/20`
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