Diane has five identical blue disks, two identical red disks and one yellow disk.She wants to place them on the grid below so that each cell contains exactly one disk.
The two red disks are not to be placed in cells that share a common edge.
How many different-looking completed grids can she produce?
Select one option, then click Submit.
96
108
144
180
216
Select an option, then submit.
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Senior Mathematical Challenge 2020 (2020)
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