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Let A={1,2,3,4} and B={5,7,8,9} be two s...

Let A={1,2,3,4} and B={5,7,8,9} be two sets and the relation R from A to B be defined as `R={(a,b)in A times B:|a-b|` is an even number } .Then the number of elements in the relation R is

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