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all finite set is countable.but,countable can be finite or infinite

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Q: What is the Difference between a finite set and countable set?
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What are the different types a of set?

A null set, a finite set, a countable infinite set and an uncountably infinite set.


What is the difference between a finite set and an infinite set?

Set A is a finite set if n(A) =0 (that is, A is the empty set) or n(A) is a natural number. A set whose cardinality is not 0 or a natural number is called an infinite set.


What is countable set and uncountable set?

A countable set is defined as one whose elements can be put into one-to-one correspondence with elements of the set of counting numbers or some subset of it. A countable set can be infinite: for example all even numbers. This raises the strange concept where a subset (positive even numbers) has the same cardinality as all counting numbers - which should be a set that is twice as large! Even more confusingly (perhaps) is the fact that the set of all rational numbers also has the same cardinality as the set of counting numbers. You need to go to the set of irrationals or bigger before you get to uncountable sets. So you have the weird situation in which there are more irrationals between 0 and 1 than there are rationals between from 0 and infinity (if infinity can be treated as a value)! There is a minority definition of countable which means containing a finite number of elements as opposed to uncountable meaning infinitely many elements. However, these definitions are essentially the same as the finite sets and infinite sets and so there is little point in using them.


Is a set of prime numbers an finite set?

Finite, no.


Why is an empty set a finite set?

An empty set is considered a finite set because it contains zero (0) elements and zero is a finite number.