Question 5
A counterfeit-money detector is given a testing frame. It places the frame on three overlapping parts of a banknote, moving top to bottom. If any tested part fails to match the frame, the note is counterfeit. The example shows tests for 1-unit notes: “Tiền thật” means genuine and “Tiền giả” counterfeit.
The following frame is used for 2-unit notes.
Which note will be judged genuine?
The following frame is used for 2-unit notes.
Which note will be judged genuine?
