b) Read Section 2.3.6 (on page 161) of the 8'th edition of Rosen's book on partial functions. Let A and B be finite sets, with |A| = m and |B| = n. Calculate the number of partial functions f: A -> B.
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A partial function f rom to is a map from to . If has elements such that . So there are of such map.
In addition, there will be subsets of . So, the number of partial functions will be;