calculating proability

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Tutor: None Selected Time limit: 1 Day

am finding difficulties in calculating these proabilities  from question 7 to 8

Mar 5th, 2015

There is no question 7 or question 8

Mar 5th, 2015
Mar 5th, 2015
Mar 5th, 2015

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Mar 5th, 2015
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Mar 5th, 2015
Dec 8th, 2016
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