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SED ruling on the password problem
Posted:
Jun 16, 2012 7:52 PM


On the password problem (#39 maybe?) we called with two questions:
Q: For the second password, if the student does 9*9*9*9*9*9 instead of 10*10*10*10*10*10, is that a conceptual or computation error?
SED: Conceptual, 2 points off.
Q: On the last part, is the explanation, "second method, because it makes more passwords" sufficient?
SED: Yes

I thought the first ruling was too harsh and the second too lenient.
True, idea that 0 is a digit is an important concept: it's just the foundation of the Arabic system of numeration. But in the context of this problem, this error was worth 50% off? Really? So a student who does everything right for the two kinds of passwords and does the last part right gets 2 out of 4?? The same as a student who doesn't understand the difference between with duplication and without?
For the explanation, it seems to me that the student needs to refer to the number of passwords needed, and say something about there being NOT ENOUGH of the first type and that there ARE ENOUGH of the second type. Just because there are more of the second type doesn't make it work.
Evan Romer Susquehanna Valley HS Conklin NY ******************************************************************* * To unsubscribe from this mailing list, email the message * "unsubscribe nyshsmath" to majordomo@mathforum.org * * Read prior posts and download attachments from the web archives at * http://mathforum.org/kb/forum.jspa?forumID=671 *******************************************************************



