Q17 of 128 Page 13

In a lottery there are 10 prizes and 25 blanks. What is the probability of getting a prize?

Sample space, n(S) = 35


Number of events of getting a prize, n(E) = 10



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15

A bag contains 5 white and 7 red balls. One ball is drawn at random. What is the probability that ball drawn is white?

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Tickets numbered from 1 to 20 are mixed up and a ticket is drawn at random. What is the probability that the ticket drawn has a number which is a multiple of 3 or 7?

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If the probability of winning a game is 0.3, what is the probability of loosing it?

 19

A bag contains 5 black, 7 red and 3 white balls. A ball is drawn from the bag at random. Find the probability that the ball drawn is:

(i) red


(ii) black or white


(iii) not black