9x9 Kenken without Operation Signs 01 Step 12

http://mathmojo.com/kenken How to do a 9x9 Kenken Puzzle without Operation Signs. This is the twelfth in a series of videos that will teach how to complete a fairly advanced 9x9 Kenken.

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[osr31770]

Sorry, Hoskeebo, but your logic is deeply flawed. You make assumptions about the 4 cage in the upper left that it must be either addition or multiplication. But what about division or subtraction? There are numerous other ways to get to 4 -- 8 divided by 2 divided by 1 OR 9 minus 2 minus 3 OR 8 minus 2 minus 2. You cannot assume that there is a 1 in the upper column, so your entire sequence (including the elaborate detour in parts 10a, b, and c) falls apart.

[hoskeebo]

Where did you get the Idea that I think I am always right, or that my way is the only way?

One thing that I did assume, is that if you are doing a 9x9 Kenken, you are clear on the rules of Kenken. That was a bad assumption, and I'm sorry.

Kenken is a trademarked term, and official rule on the issue you are referring is in the Will Shortz books. : "Cages with more than two squares will always involve addition or multiplication. Subtraction and division occur only in cases with two cells."

[hoskeebo]

I didn't make the rule, in fact, I don't even like the rule. But that is the rule in Kenken. There are other versions of similar games that have different rules, and anyone is free to play and enjoy them. But they are not Kenken.

I appreciate your concern about my flawed logic, but in this case your concerns are misplaced. Don't worry, though, I'm sure I'll give you lots of other chances to find flaws in my logic. The only flaw you won't find is one where I think I'm "the big perfect expert."

[hoskeebo]

There is a good discussion about the the issue of the non-associativity of division and subtraction rule at motris.livejournal (dot com) /60252.html#comments

[osr31770]

My mistake for not knowing about that rule, although it seems to take a lot of the challenge out of the "no operation signs" puzzle (and, in fairness, you didn't mention it during your videos).