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topaz: (Morgan - thrashin')
[personal profile] topaz
Morgan's homework today included this problem (reproduced here verbatim):
If you have one dice with the numbers 1, 2, 3, 4, 5, and 6. Expressed as a fraction, what is the probability of rolling a double (2 of the same number) in 25 rolls?
The probability that at least one number will come up twice is clearly 100%.  We're assuming that they're asking for the probability that at some point two consecutive rolls will turn up the same number.

This seems like a remarkably sophisticated problem to assign a sixth-grader.  It looks like it would have been a reasonable problem for my probability midterm in high school.  Does anyone here disagree?

Edit: The problem was not made up or handwritten by the math teacher -- it was submitted as part of a Math 4 Today handout that he gets assigned on a weekly basis.  For better or for worse, this was part of a standard curriculum math workbook.  (And they wonder is our children learning anything!)

Date: 2010-03-26 08:18 pm (UTC)
From: [identity profile] cruiser.livejournal.com
Clearly, the correct answer is supposed to be "Cannot be determined from information provided."

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