If Kennedy lectures at 3:00 on Friday, which one of the following must be true?

Olivia on April 11, 2022

Why can’t Navarro go on Thursday at 2? Thurs - M N L Friday - J O K?

Why can’t Navarro go on Thursday at 2? Thurs - M N L Friday - J O K?

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Emil on April 16, 2022

Hi Olivia,

You're correct that N could be at two on thursday. In fact, it is also possible that M is at 1 on thursday. However, this question is asking what must be true, rather than what could be true. It is also possible that N is at 1 or 3 on thursday, and that M is at 2 or 3 on thursday. However, we know that O is on friday, and the J must be the first on friday and K must be last, so the only space for O is 2pm on friday. Thus, it must be true that O is at 3 on friday.