Final answer:
Fabian should print either 1 slide or 0 slides per audience member, depending on his preference and the purpose of the slides.
Step-by-step explanation:
If Fabian has 25 slides and an audience of 50, he can print out 1 slide for every 2 audience members. To calculate the number of slides he should print for each audience member, divide the total number of slides by the total number of audience members: 25 slides ÷ 50 audience members = 0.5 slides per audience member. Since he can't print half a slide, he should either round up or round down. If he rounds up, he should print 1 slide for every audience member. If he rounds down, he should print 0 slides. It depends on Fabian's preference and the purpose of the slides whether he wants to print them out or not.