Help! Uncertain Groups Drill Solution (2016 edition)

    • January 5, 2017 at 12:39 pm #2933


      This is my first post since joining this community (just joined today).

      I have been working on the trainer for a couple of weeks now and I am completely stumped on the uncertain groups drills – question #3. I was comparing my answers to the solutions and I cannot for the life of me see how 1 and 3 have two positions that are crossed out. In my solution, only one has been crossed out. Is this because the rule says that 1 and 3 have the same number but different colors?

      Please help me with the reasoning because I have been going crazy trying to figure this out.


    • January 5, 2017 at 3:12 pm #2934
      Mike Kim

      Hi — welcome and glad to have u here! —

      The cross-outs are indeed because of that “not same” rule —

      If we try, for example, to put three ingredients into dish 1 and three ingredients into dish 2, since there are only 4 ingredients total, there is no way to do this without using at least one common ingredient in both dishes — thereby violating the rule.

      So, because of the rule that 1 and 3 have the same # of ingredients but none of the same ingredients, those dishes could either have 1 ingredient each or 2 ingredients each, but no more than that.

      Beyond that, since we know the third dish uses more ingredients than the fifth, we know the third dish must use more than 1 ingredient.

      Putting those two things together, what we know is that

      a) the third dish must use exactly 2 ingredients &
      b) those two ingredients must be different from the 2 ingredients used in the first dish.

      I hope that helps clear it up, and if you have any follow-up q’s just let me know —


    • January 5, 2017 at 4:49 pm #2935

      Wow! That makes sense.

      Thank you for the explanation!

    • January 8, 2017 at 10:01 am #2938
      Mike Kim

      Great! Happy to help – MK

You must be logged in to reply to this topic.