For all sets A, B and C, determine whether A-(B-C)=(A-B)-C is true or false. Justify your answer.
Solution
Let us use the following Venn diagram to solve this question
Step 1: - B - C
Step 2: - A-(B-C)
Step 3: - A-B
Step 4: - (A-B)-C
As steps 2 and 4 are unequal, hence, the statement given is not true.