Question

If P = {x | 24 smaller then x smaller then 30} and Q = { x | 25 smaller then x smaller then 32} , prove that P-Q Not equal - P

Answer 1

P={25,26,27,28,29}
Q={26,27,28,29,30,31}
P - Q ={25}
Q - P ={30,31}
Therefore
P -Q is not equal to Q - P