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Given set A={m,b,f,a,s} and B={m,b,s}

a) Is {<m,s>, <b,m>, <f,m>, <a,b>} a function? Is it a relation or function from A to B, A to A, B to A, B to B or none of the above?

b) Is { } a function? Is it a relation or function from A to B, A to A, B to A, B to B or none of the above?

Please note that { } stands for the empty set

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# Relations and functions

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