mathmath333
  • mathmath333
set theory
Mathematics
  • Stacey Warren - Expert brainly.com
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jamiebookeater
  • jamiebookeater
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mathmath333
  • mathmath333
State which of the following sets are finite or infinite : \(\large \color{black}{\begin{align}& (i)\ \{x : x \in \mathbb{N} \ \ and \ \ (x – 1) (x –2) = 0\} \hspace{.33em}\\~\\ & (ii)\ \{x : x \in \mathbb{N} \ \ and \ \ x^{2} = 4\} \hspace{.33em}\\~\\ & (iii)\ \{x : x \in \mathbb{N} \ \ and \ \ 2x –1 = 0\} \hspace{.33em}\\~\\ \end{align}}\)
welshfella
  • welshfella
sorry I've done this stuff in the past but i cant recall it well enough.
ikram002p
  • ikram002p
well lets try each one condition solution :)

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ikram002p
  • ikram002p
to me i and ii are finite and iii is Empty which is also finite
ikram002p
  • ikram002p
in which way this confuses u @mathmath333 ??
mathmath333
  • mathmath333
prove that an empty set is finite set
ikram002p
  • ikram002p
awww thats so cute question :P
ikram002p
  • ikram002p
i have many proves the most lovely one is using this :- there are infinite subsets of an infinite set and there are finite subsets of a finite set. thus subsets of an Empty set is ( 2^0=1) which is finite QED.
mathmath333
  • mathmath333
does empty set has a subset
ikram002p
  • ikram002p
yes it does have 1 subset which is also an empty set (itself only)

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