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Probability

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
Answer

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
Answer