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Let E=[]1,2,3,4] and F=(12) Then the num...

Let `E=[]1,2,3,4] and F=(12)` Then the number o onto functions from E to F is (A) 14 (B) 16 (C) 2 (D) 8

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From E to F, we can define, in all, `2xx2xx2xx2=16` functions (2 options for each element of E) out of which 2 are into, when all the elements of E either map to 1 or to 2. Therefore, Number of onto functions `=16-2=14`
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