If the computer in office 4 was bought in 1988, then which one of the following statements must be true?
NayaJSJuly 10, 2023
How do we know the printer in office 1 is 89?
In the video the speaker automatically says the printer in office one is 89. How do we know this? I thought it could be either 88 or 89 based on the first rule and what was used in the game set up.
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Hi, if the computer in 4 is 8, we know the printer in 4 is also 8, since the computer must be older or equal to the printer. This forces the computer in 3 to also be from 8, and since 2 and 3 must have different years for their computers, this forces the computer in 2 to be from 9. Finally, this means that the printer in 1 was also 9.
