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Question

Choose the correct answer.
The probability of obtaining an even prime number on each die when a pair of dice is rolled is
(a) zero (b) 13 (c) 112 (d) 136

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Solution

When a pair of dice is rolled once, the sample space contains 6×6=36 elements.
i.e., n(S) = 36
The only even prime number is 2.
Let E be the event of getting an even prime numbner on each die, E = (2, 2)
i.e., n(E) = 1
Required probability = P (an even prime on each die)
=n(E)n(S)=136


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