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प्रश्न
A die is rolled twice What is the probability that the sum of the numbers on the two faces is 5?
विकल्प
`3/13`
`4/13`
`6/13`
`1/9`
उत्तर
`1/9`
Explanation:
When a dice is rolled twice
Total sample space = 36
Sample space that sum of the number appear is 5 = (1, 4) (2, 3) (4, 1) (3, 2)
i.e. n(E) = 4 ∴ P(E) = `4/36 = 1/9`
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