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There is a set of 14 jobs in the printer queue. Two of the jobs in...

There is a set of 14 jobs in the printer queue. Two of the jobs in the queue are called job A and job B.

a) How many ways are there for the jobs to be ordered in the queue so that either job A or job B finish last?

b) How many different ways are there for the jobs to be ordered in the queue so that job A is first or job B is last or both?

Math   Statistics-And-Probability   
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