Probability

1.

Tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random. What is the probability that the ticket drawn has a number which is a multiple of 3 or 5?

A. 1 2 B. 2 5 C. 8 15 D. 9 20 2.  A bag contains 2 red, 3 green and 2 blue balls. Two balls are drawn at random. What is the probability that none of the balls drawn is blue? A. 10 21 B. 11 21 C. 2 7 D. 5 7 3.  In a box, there are 8 red, 7 blue and 6 green balls. One ball is picked up randomly. What is the probability that it is neither red nor green? A. 1 3 B. 3 4 C. 7 19 D. 8 21 E. 9 21 4.  What is the probability of getting a sum 9 from two throws of a dice? A. 1 6 B. 1 8 C. 1 9 D. 1 12 5.  Three unbiased coins are tossed. What is the probability of getting at most two heads? A. 3 4 B. 1 4 C. 3 8 D. 7 8