Homework Statement
Prove that: A\cup(B\cupC) = (A\cupB)\cupCHomework Equations
The Attempt at a Solution
I never had to prove anything but I'll try.
A\cup(B \cupC).
Take:
A = {1, 2, 3, 4, 5}, B = {5, 6, 7, 8, 9, 10}, C = {7, 8, 9, 10}
(B\cupC) = P
If A\cupP means A, united with the union of B...