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What do you call an objects in a set?
An element or member of the set.
Definition of UNIT set?
The unit set of x is the set whose sole member is x. The unit set is to be distinguished from its member: for example, the unit set of the set of days of the week has one member, but that member is itself a set that has seven members.
Which set possesses only one proper subset?
A set with only one element in it. The only proper subset of such a set is the null set.
Is twenty-one a member of the prime number set?
A prime number is a number that only has two factors. That is, it can only divide evenly (without leaving a remainder) by 1 and itself. 21 can divide by 3 to give 7. Therefore it has more factors than just 1 and itself. Thus twenty-one is not a member of the prime number set.
What is the rule of a set of numbers?
The only rule for any set is that given any element [number], you should be able to determine whether or not it is a member of the set.
