Let \( X=\{1,2,3,4\}, Y=\{1,5,9,11,15,16\} \) and \( f=\{(1,5),(2,9),(3,1),(4,5),(2,11)\} \). Ar...

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Let \( X=\{1,2,3,4\}, Y=\{1,5,9,11,15,16\} \)
and \( f=\{(1,5),(2,9),(3,1),(4,5),(2,11)\} \).
Are the following true?
\( f \) is a function from \( X \) to \( Y \). Justify your answer in each case.
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