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a set which has no elements in it is called a null set. example - A={}.
Many people describe the shape of Mexico in many different ways. Some will describe Mexico as looking like a blob that has no particular shape.
We can't answer that unless you tell us what two ways were shown.
There are many ways of classifying sets. One way is by the size of the set: its cardinality.On this basis a set may beFinite,Countably infinite, orUncountably infinite.
Each of these measures of central tendency has its own advantages and disadvantages. Different measures are best in different circumstances.