$\begin{array}{1 1} 16 \\ 14 \\ 12 \\ 8 \end{array}$

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- In Onto function all the elements of B should be related.

Ans: (B) =14

case (i)

Any 3 elements of A mapped with one element of B and

one element of A is mapped with the other element of B.

$=^4C_3\times^2C_1=4\times2=8$ onto functions.

case(ii)

Any 2 elements of A mapped with one element of B and

other two elements of A is mapped with the other element of B.

$=^4C_2\times^2C_1=3\times2=6$ onto functions.

Total $8+6=14$

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