Molly has a set of cards numbered 1 to 12. She places eight of them at the vertices of an octagon so that the sum of every pair of numbers at opposite ends of an edge of the octagon is a multiple of 3. Which numbers did Molly not place?
Select one option, then click Submit.
1, 5, 9 and 12
3, 5, 7 and 9
1, 2, 11 and 12
5, 6, 7 and 8
3, 6, 9 and 12
Select an option, then submit.
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