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Grade: 12
        Himani rolls two standard cubes. Find the probability that the sum of the roll is 5, given that one cube came up even and the other came up odd. 

a) 1/36
b)1/9
c)5/36
d)2/9
6 years ago

Answers : (2)

bharat bajaj
IIT Delhi
askIITians Faculty
122 Points
							
As it is given that one is even & one is odd, the sample space is not 36, it is only 18 !

Sample spacewith favourable outcomes :
1 & 4
4 & 1
2 & 3
3 & 2


Probability = 2/9
Thanks & Regards
Bharat Bajaj
askIITians Faculty
IIT Delhi
6 years ago
SREE NIGAMADITYA NIMMAGADDA
35 Points
							for this the outcomes can be 
4&1,
1&4,
2&3,
3&2, 
but here we might think that sample space is `36` but its "18" since it is given that one is even and one is odd.
so the probability would be equal to "4/18"=2/9
						
6 years ago
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