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If 70% of the registrants pass the morning session, 65% pass the morning and afternoon sessions,...

If 70% of the registrants pass the morning session, 65% pass the morning and afternoon sessions, and 20% fail both sessions, what's the probability that a registrant has failed the afternoon exam given he/she has failed the morning session? a)75% b)66.7% c)50% d)62.5%

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