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tabular and rule method
(1) List the elements, and (2) Define a rule that elements of the set must fulfill.
The locus of a point is the set of all positions that the point can occupy where it satisfies some defining function.
a set which has no elements in it is called a null set. example - A={}.
The answer depends on what the Universal set is.If the universal set is the set of all real numbers, then a' is the set of all real numbers that leave a non-zero remainder when divided by 2. Another way of defining a' is: {x | x is Real, mod(x, 2) >0}.