If \( A=\{1,2,3,4\} \) and \( B=\{-1,3\} \), then write the number of onto functions from \( A \...

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If \( A=\{1,2,3,4\} \) and \( B=\{-1,3\} \), then write the number of onto functions from \( A \) to \( B \).
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