(A−B)−(B−C)=___
A - B
B - C
A - C
A - B - C
(A−B)−(B−C) [∵A−B=A∩B′]=(A∩B′)∩(B∩C′)′=(A∩B′)∩(B′∪C) [∵(A∩B)′=A′∪B′]=A∩[B′∩(B′∪C)]=A∩B′=A−B