There may not be any relationship between number of sets and number of elements. You can have just one set or thousands of sets. Similarly, you can also have just one element (rare) or thousands of elements.
There are various types of sets based on the relationship between their elements. Some common types include: Empty set: A set containing no elements. Singleton set: A set with only one element. Finite set: A set with a countable number of elements. Infinite set: A set with an uncountable number of elements. Subset: A set where all elements are also elements of another set. Proper subset: A subset that is not equal to the original set. Universal set: A set that contains all elements under consideration. Disjoint set: Sets that have no common elements. Power set: A set consisting of all possible subsets of a given set.
For a set with a finite number, n, of elements, the number of subsets in 2^n. This includes the null set and the set itself. Things get a bit complicated if the original set has infinitely many elements. It is still 2^k but the complications arise because of infinities and transfinite numbers.
A finite set, with n elements has 2n subsets, including the empty set and itself. For infinite sets the number of subsets is the same order of infinity.
Equality is a relationship that can be defined on the elements of a set. Equality holds between two elements that have the same value.
A finite set is one containing a finite number of distinct elements. The elements can be put into a 1-to-1 relationship with a proper subset of counting numbers. An infinite set is one which contains an infinite number of elements.
The difference between joint sets and disjoint sets is the number of elements in common. A disjoint set, in math, does not any elements in common. A joint set must have at least one number in common.
A finite set has a finite number of elements, an infinite set has infinitely many.
The number of elements. A set with n elements has 2n subsets; for example, a set with 5 elements has 25 = 32 subsets.
The number of subjects will depend on what the elements of the set are. The number of subsets is 2a.
The cardinality of a set is the number of elements in the set.
A finite set or a countably infinite set.
The median. If there are an odd number of elements in the set, there is a middle number which is the median. If there are an even number of elements in the set, the median is the mean of the middle two numbers.