Activity A$1$ ?takes $5$ ?weeks, A$2$ ?takes $8$ ?weeks, and A$3$ ?takes $2$ ?weeks. What is the latest completion time of A$3?$ ?Every task has to be done in order to complete the project. $($Hint: Remember LCtime is the latest time by which you will have to complete that task $-$ ?even though you may sometimes have a choice of doing it earlier$)$

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$13$ ?weeks

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$10$ ?weeks

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$15$ ?weeks

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$7$ ?weeks