Four fair dice 
and 
each having six faces numbered 1, 2, 3, 4, 5 and 6 are rolled, simultaneously. The probability that 
shows a number appearing on one of 
and 
is 
, then 
is
Text Solution
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Sample space 
Favourable events 
Case I or Case II or Case III
Case I First, we should select one number for 
which appears on all i.e. 
.
Case II For 
there are 
ways. Now, it appears on any one of 
i.e. 
.
For other two there are 
ways
Case III For 
there are 
ways. Now, it appears on any two of 
For other one there are 5 ways.
Required probability
and 
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