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How many ways are there to put 9 differently colored beads on a 3 by 3 grid if the purple bead and the green bead cannot be adjacent (either horizontally, vertically, or diagonally), and rotations and reflections of the grid are considered the same?

 Jun 15, 2020
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There are 8*9 = 72 ways to place the beads.

 Jun 16, 2020

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