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UPSC NDA Math Model Paper 9
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© examsnet.com
Question : 41
Total: 120
A bias dice has probability of getting any of the odd number equal to the inverse of immediate greater even number and the possibility of getting any of the even number are equal, then what is the probability of getting an even number.
1
36
1
18
1
12
1
9
Validate
Solution:
According to the question;
Probability of getting '1'
=
1
2
Probability of getting '3'
=
1
4
Probability of getting '5'
=
1
6
Let the probability of getting an even number be
x
As
∑
P
=
1
⇒
x
+
1
2
+
1
4
+
1
6
=
1
⇒
x
=
1
12
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