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Question

A die marked with numbers 1,2,2,3,3,3 is rolled three times. Find the probability of occurrence of 1,2 and 3 respectively

A
1/12
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B
1/6
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C
1/36
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D
1/24
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Solution

The correct option is B 1/36
Given,
A Die marked with faces 1,2,2,3,3,3 and it is rolled 3 times.
The total no. of outcomes when a die rolled 3 times, N=6×6×6=216
The total no. of outcomes to get 1,2,3 on first,second and third roll,X=1C12C13C1=6 (since no.of ways for 1 to come on first die=1C1,no. of ways for 2 to come on second die=2C1, no. of ways for 3 to come on third die=3C1)
The required probability=XN=6216=136

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