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NIMCET 2013 Question Paper with solutions
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© examsnet.com
Question : 5
Total: 120
A six faced die is a biased one. It is thrice more likely toshow an odd number than to show an even number. It is thrown twice. The probability that the sum of numbers in the two throws is even is :
4/8
5/8
6/8
7/8
Validate
Solution:
Let the probability to show an even number be P.
As per the question,
Probability to show an odd number will be 3P
∴
3
P
+
P
=
1
⇒
4
P
=
1
⇒
P
=
1
4
So,
3
P
=
3
4
Required probability
=
3
4
×
3
4
+
1
4
×
1
4
=
9
16
+
1
16
=
10
16
=
5
8
© examsnet.com
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