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?
A
1
3
B
1
4
C
4
6
D
1
2
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
?
A
3
28
B
1
28
C
5
28
D
1
5
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
?
A
7
15
B
8
15
C
1
15
D
7
8
Question 4:
A girl picks one natural number from
1
to
20
. What is the probability that the number is a factor of
20
?
A
1
20
B
3
10
C
1
10
D
3
20
Question 5:
What is the probability of getting an odd number when a fair dice is thrown?
A
1
2
B
1
3
C
2
3
D
1
6
Question 6:
How many different ways six people can stand in a queue?
A
720
B
12
C
36
D
620
Question 7:
Calculate
A
6
3
A
102
B
3
C
18
D
120
Question 8:
In how many different ways is it possible to pick any
4
books from a set of
7
books?
A
35
B
28
C
44
D
74
Question 9:
Solve the equation for
a
:
C
a
a
−
2
=
45
A
47
B
20
C
30
D
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?
A
0.24
B
0.4
C
0.8
D
0.13
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