The math department has installed two new printers, A and B. In
his quest to accelerate global warming, Alex decides to kill trees
by printing textbooks. He chooses to print from printer A with
probability 3/4 and from printer B with probability 1/4. While
printing, printer A has probability 1/10 of jamming and immediately
destroying the current sheet of paper, and printer B has an
independent 1/20 chance of doing the same. Satisfied with this
plan, Anton sends off his...