anonymous
  • anonymous
1. How many distinct binary relations can be constructed from a given set A with cardinality 3 to a given set B with cardinality 4?
Mathematics
  • Stacey Warren - Expert brainly.com
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
I think I can construct 3 * 4 + 1 distinct binary relations.
anonymous
  • anonymous
I think I was lost. To know the number of binary relations I can get from to given set with known cardinalities I need to know the cardinality of the power set of the cartesian product. I know that the cardinality of a power set is given by:\[\#P(A) = 2^{\#A}\]
anonymous
  • anonymous
And I know too that the cardinality of the Cartesian product is equal to the product of the cardinalities of every set involved. So \[\#(A\times B) = \#A\cdot \#B\]

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anonymous
  • anonymous
So \[\#P(A\times B)=2^{\#A\cdot \#B}\]
anonymous
  • anonymous
So the number of binary relations I cant get is given by: \[ 2^{12} \]
anonymous
  • anonymous
Is it right?

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