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15 September, 08:40

Anita and Amy appeared for the same interview. Depending on their qualifications, the probability that Anita will be selected is 5/7 and the probability that Amy will be selected is 2/5.

What is The probability that neither of them is selected is:

And The probability that at least one of them is selected is:

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  1. 15 September, 09:32
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    P (Anita not selected) = 2/7 and P (Amy not selected) = 3/5)

    P (neither selected) = 2/7 * 3/5 = 6/35

    P at least one is selected = (5/7 * 2/5) + (5/7 * 3/5) + 2/7*2/5)

    = 10/35 + 15/35 + 4/35 = 29/35

    Oh it would have been easier to use 1 - (neither selected) = 1 - 6/35

    = 29/35
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