Suppose a fair die is cast seven times to obtain a sequence of seven numbers.
(a) Describe the universal set of sequences in words.
(b) How many sequences have each entry either a 3 or a 5?
(c) If A is the subset of sequences containing no 1's, describe the set Ac in words. (d) Find the number of elements in the set A.
(e) How many elements are in the set Ac?
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