3.22 If among n objects k are alike and the others are all distinct, the number of permutations of these n objects taken all together is n!/k!. (a) How many permutations are there of the letters of the word class? (b) In how many ways can the television director of Exercise 3.21 fill the 6 time slots allocated to com- mercials, if there are 4 different commercials, of which a given one is to be shown 3 times while

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