The total number of onto functions from the set \( \{1,2,3,4\} \) to the set \( \{3,4,7\} \) is ...

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The total number of onto functions from the set \( \{1,2,3,4\} \) to the set \( \{3,4,7\} \) is
(A) 18
(B) 36
(C) 64
(D) none of these
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