Let A={1,2,3,....n} and B={a,b}. Then the number of surjection from A into B is $$\begin{array}{1 1}(A)\quad"p_2 \qquad & (B)\quad 2"-2\\ (C)\quad 2^n-1 \qquad & (D)\quad none\;of\;these\end{array}$$

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