Suppose that a = 5 and b = 20.
(a) How many elements are there in {a..b}?
(b) How many 4-sequences on {a..b} are there?
(c) How many 4-permutations on {a..b} are there?
(d) How many 4-permutations on {a..b} begin with 8?
(e) How many increasing 4-sequences on {a..b} are there?
(f) How many increasing 4-sequences on {a..b} begin with 8?
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