Question

Considerando-se que: A U B U C = { x ∈ ℵ / 1≤n≤10}, A∩C = {2, 7}, B∩C = {2, 5, 6} e A U B = {x∈ℵ/ 1≤n≤8}.
Determine A, B, C!

Answer 1

A U B U C = { x ∈ ℵ / 1≤n≤10}, 1,2,3,4,5,6,7,8,9,10
A∩C = {2, 7},
B∩C = {2, 5, 6}
A U B = {x∈ℵ/ 1≤n≤8}. 1,2,3,4,5,6,7,8 

A = {1,2,3, 5,6,7,8 }
B = { 2,4,5,6 }
C= { 2,5,6,7,9}