Question

A set containing exactly one element is called
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Answer 1

AnswEr:-

• A set which contains only one element is called a singleton set.

For example:

• A = {x : x is neither prime nor composite}

It is a singleton set containing one element, i.e., 1.

• B = {x : x is a whole number, x < 1}

This set contains only one element 0 and is a singleton set.

• Let A = {x : x ∈ N and x² = 4}

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Answer 2

Answer:

unit set......