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Number of Elements in a Cartesian Product

Let A=1, 2,...

Question

Let $A = {1, 2, 3, 4, 5}$ and $B = {1, 4, 5}$ . Let $R$ be a relation 'is less than' from $A$ to $B$
list the elements of $R$
Depict the above relation by an arrow diagram.

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Solution

$A = {1, 2, 3, 4, 5} B = {1, 4, 5}$

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