If the computer in office 4 was bought in 1988, then which one of the following statements must be true?

Naz September 2, 2014

You can access the full video explanation for this game if you click on the "play" button on the top right-hand corner of the screen.

Hope that clears things up! Please let us know if you have any other questions.

grahamstinnett August 15, 2018

Is there any reason why we can't just use the hypo in #10 to save time?

NayaJS July 10, 2023

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.

Emil-Kunkin October 15, 2023

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.