For each of exerciser 37-39, the number of dements in a certain set can be found by computing the number in a larger universe that are not in the set and subtracting this from the total in the larger universe. In each of these, as was the case for the solution to Example 9.3.6<b). De Morgan's laws and the inclusion/ exclusion rule can be used.
How many permutations of abcde are there in which the first character is a, b or c and the but character is c, d. or e?
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