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15. Probability
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Q13 of 14 Page 15

Find the probability of choosing square numbers between 2 and 100.

Sample space S = {2, 3, …, 100}
Therefore n(S) = 99
Let A denote the event of choosing a square number.
Then A = {4, 9, 16, 25, 36, 49, 64, 81, 100}
   n(A) = 9
Therefore P(A)= = .

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10 17 cards numbered 1, 2, 3, ..., 16, 17 are put into a box and mixed thoroughly. One person draws a card from the box. Find the probability that the number on the card is a prime. 11 Tickets numbered 1 to 20 are mixed up together and then a ticket is drawn at random. What is the probability that the ticket has a number which is a multiple of 3 or 7? 12 Two dice are thrown. What is the probability of obtaining a total of 10 or 11? 14 In a throw of a fair die, what is the probability of getting a number greater than 4?
Questions · 14
15. Probability
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