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Question
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 2-digit number.
Solution
S = {1, 2, 3, 4, 5, ... 20}
∴ n(S) = 20
2 digit number {10, 11, 12, ... 20}
∴ n(E) = 11
Required probability = `(n(E))/(n(S)) = 11/20`
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