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Is this a difficult math problem for ninth grade?
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April 7th, 2011
I just did an online tutoring session to help a student solve this problem. I invite you to try it for yourself. I think I have the answer right, but I also seriously doubt whether I could have done this in ninth grade.
Nine beads of different colors are arranged in a 3 by 3 array. If we require the green one and the purple one not be adjacent to each other vertically, horizontally or diagonally, how many ways are there of arranging the beads, counting rotations and reflections as one arrangement?
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