Question #1641

Question 4

Started by AlexanderX · started 2019-10-04 16:56 · last activity 2019-10-04 23:47 · 3 replies

Just confused that why I cannot put both I and R into grade E? Please help, thanks!

Replies

  1. BenMingov · 2019-10-04 20:14

    Hi Alexander, thanks for your question! In this scenario, we know that G comes before P, P comes before E, E comes before H, and H comes before I. This immediately fills in our 5 slots. We know that I and R come consecutively, but we do not know which comes before the other. We can attempt to put I before R, but then we notice that there is no grade below E and that this cannot work. Only one scenario is possible, and that is where R comes before I in grade D (along with H). Because each variable is firmly placed, we know all 6 are determined. Hope this helps!

  2. AlexanderX · 2019-10-04 20:44

    Understood. Thanks a lot!

  3. BenMingov · 2019-10-04 23:47

    You are welcome :)

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