V V A B C U 1 2 3 7 8 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10
V V A B C U 1 2 3 7 8 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10
V V A B C U 1 2 3 7 8 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10
V V A B C U 1 2 3 7 8 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10
A ∩ B B∩ V V A B C U 1 2 3 7 8 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10
(A ∩ B) ՛ (B∩ V V A B C U 1 2 3 7 8 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 ՛
A ∪ B B V V A B C U 1 2 3 7 8 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10
(A ∪ B) ՛ (B V V A B C U 1 2 3 7 8 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10
A ՛ ∪ B ՛ B V V A B C U 1 2 3 7 8 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10
A ՛ ∩ B ՛ B V V A B C U 1 2 3 7 8 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10
V V A B C U 1 2 3 7 8 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10
V V A B C U 1 2 3 7 8 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10
V V A B C U 1 2 3 7 8 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A∩( B ∪C ) ՛ ∪ ∪ C A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 B∩( A ∪C ) ՛ C∩( A ∪B ) ՛ ՛
V V A B C U 1 2 3 7 8 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A B C U 1 8 2 3 7 4 5 6,9,10 A∩( B ∪C ) ՛
More than 250 combinations of shadings are possible for three circle problems as given by the sum of combinations: n r nCr 8 1 8 8 2 28 8 3 56 8 4 70 8 5 56 8 6 28 8 7 8 8 8 1 255