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Question

A pair of dice is thrown once. Find the probability of getting an even number on the first dice.


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Solution

There are a total of 36 possible outcomes.

The following are the possible outcomes of a pair of dice thrown in sample space,

{(1,1) , (1,2) , (1,3), (1,4), (1,5), (1,6), (2,1), (2,2), (2,3), (2,4), (2,5), (2,6), (3,1), (3,2), (3,3), (3,4), (3,5), (3,6), (4,1), (4,2), (4,3), (4,4), (4,5), (4,6), (5,1), (5,2), (5,3), (5,4), (5,5), (5,6), (6,1), (6,2), (6,3), (6,4), (6,5), (6,6)}

Let E denote the event of an even number on the first dice, and there are 18 possible outcomes.

The following are the favourable outcomes of event E

{(2,1), (2,2), (2,3), (2,4), (2,5), (2,6), (4,1), (4,2), (4,3), (4,4), (4,5), (4,6), (6,1), (6,2), (6,3), (6,4), (6,5), (6,6)}

ProbabilityofeventtohappenP(E)=NumberoffavourableoutcomesTotalNumberofoutcomes

PE=nEnS

PE=1836=12

Therefore, Probability of getting an even number on the first dice =12


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