Of the 1,000 students in a local college, 420 own brand X mobile phones and 580 own brand Y mobile phones. Of these students, 80 own both brands of mobile phones. Find the probability that a student chosen at random has a brand X mobile phone given that he has a brand Y mobile phone.
2/14
5/21
3/28
4/29

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@Miss.SweetiePie

sorry for bugging! it's just that i cant get any wrong or else i wont pass

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