Let \( A=\{1,2,3,4\} \& B=\{1,21,17,45,51\} \) function \( \mathrm{...

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Let \( A=\{1,2,3,4\} \& B=\{1,21,17,45,51\} \) function
\( \mathrm{P} \)
is defined from set \( A \) to set \( B \). Which of the following
W
is function?
(1) \( f=\{(1,21),(3,17),(2,21),(3,51) \)
(2) \( f=\{3,1),(2,51),(1,21),(4,45),(3,51)\} \)
(3) \( f=\{(4,1),(2,17),(3,45),(1,51)\} \)
(4) \( f=\{(1,17),(2,4),(2,5)\} \)
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