A function is a relation in which each element in the input is mapped to how many elements in the output? exactly one one or more one or two exactly two
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A function is a relation i.e. the set of the ordered pair of the type: (x,y) such that each element of the first set i.e. the input is mapped to a unique element of the other set. i.e. each element has a single image. and 1 is also mapped to 4 i.e. the ordered pair (1,4) .
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