Detective: Laser-printer drums are easily damaged, and Support any nick in a drum will produce a blemish of similar dimensions on each page produced by that printer. ██ ██ ████████ █ ███████ ██ █ ████ ████ █ ████ ██ █ █████ ██ ███ ████████ █████ █ ██████████ █████████████ ████████ ██ ███ ███████ ███████ ██ █████ ██ ███ █████████
The detective concludes that he can connect a document to the laser-printer from which it was printed by matching a flaw on the document to the printer’s drum. This is because a flawed printer drum produces a similar flaw on the paper it prints.
The detective assumes that the flaws on the drums are unique and, in extension, that several drums don’t have the same flaw. He also assumes that he can access the flawed drums to compare them with the flawed documents.
Which one of the following, ██ █████ ████ ███████ ███ ███████████ █████████
Criminals are unlikely ██ ███ █████ ███ █████ ████████ ██ ███████ ██████████ ██████████
Drum nicks are ███████ ██ █████ ████ ██ ████████ █████ ██ ██████████ █████████ █████ ████ ███ ██████
The manufacturing process █████ ████████ ███ ████ ████ ██ ███████ ██████
Blemishes on documents ███ █████████ ███████ █████████ ██ ██████████ ████ ███ ███████ ████ █████
Most suspicious documents ███ ███ ████████ ██ █████ █████████