Test: Probability - Challenging

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Question 1:   There are 4 white and 8 black balls in the basket. What is the probability that a ball picked at random is of white colour?
1 2
4 6
1 4
1 3
Question 2:   One tile is picked from a domino set. What is the probability that the picked tile will have a sum of dots equal to 5 ?
3 28
1 5
5 28
1 28
Question 3:   There are 15 balls in the box, numbered from 1 to 15 . One ball is picked at random from the box. What is the probability that the number of the picked ball is less than 8 ?
8 15
7 15
7 8
1 15
Question 4:   A girl picks one natural number from 1 to 20 . What is the probability that the number is a factor of 20 ?
1 10
3 20
3 10
1 20
Question 5:   What is the probability of getting an odd number when a fair dice is thrown?
1 2
1 6
1 3
2 3
Question 6:   How many different ways six people can stand in a queue?
720
36
12
620
Question 7:   Calculate A 6 3
3
120
18
102
Question 8:   In how many different ways is it possible to pick any 4 books from a set of 7 books?
74
35
28
44
Question 9:   Solve the equation for a : C a a2 =45
30
20
47
10
Question 10:   There are 12 white, 8 yellow and 4 red roses in the basket. 9 roses are picked at random. What is the probability that there will be 4 white, 3 yellow and 2 red roses in the bouquet?
0.13
0.24
0.8
0.4