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Assertion Reasoning

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in Sets, Relations and Functions by (15 points)
Assertion: Relation R on a set A = { 1,2,3} defined by R ={(1,1)(1,2)(2,1)(3,2)} is not a function.

Reason: Domain of R={1,2,3}. Note that element 1 of the domain R has two different images 1,2 therefore R is not a function
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