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I am trying to solve a problem where I am trying to prioritize the tasks in a job based on the failure rates of each task. For ex:

Task   p(Failure)    TimeTaken(sec)
 A       0.7            10 
 B       0.1            15
 C       0.5             3
 D       0.3             5 

This is a sequence of tasks and if even one task fails, the entire job fails. So I want to prioritize my tasks to save the max amount of time. To do that I am trying to run the tasks in the order of failure probability. So my current order of performing the tasks is A,C,D and then B. I feel the problem with my approach is I am not considering the time factor. Is there a better way to prioritize my tasks based on the time taken also into consideration ?

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