The number of companies selling Frisbees in one zone is at most
Maximum cannot be 8 as then A will have more than 1 competitor.
If it is 7 , then A will be excluded from that zone and all the others will sell in that zone, then B will have more than 3 competitors. so, not possible.
If it is 6 , then we exclude B and A from that zone. then, D will have 5 competitors,not possible as given that D has 4 competitors.
If it is 5 , then we exclude A,B,G and this is a possible case.
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