identify each as a permutation or a combination . 6 books are placed from left to right on a bookshelf.______ b. 4 goldfish are selected from a tank containing 8 goldfish.______ c. 3 class representatives are chosen from 25 students.______ d. co-captains are named from a team of 16.________ e. each number 1 to 5 is used to make a 5-number security code .


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